When buying knitted fabric, buyers often focus on GSM, DIA, colour and price. These are important, but they do not completely describe how a knitted fabric is constructed.

Two basic terms that help explain knitted fabric structure are wale and course.

In simple terms:

• Wale = vertical column of loops
• Course = horizontal row of loops

These terms are used to describe the arrangement and density of loops in knitted fabrics. Understanding them can help clothing brands, garment manufacturers and fabric buyers communicate more clearly with suppliers and understand fabric specifications.

What Is a Wale in Knitted Fabric?

A wale is a predominantly vertical column of loops running along the length direction of a knitted fabric.

Imagine looking closely at a knitted fabric and following one column of loops from top to bottom. That column is a wale.

In technical terms, a wale is generally formed by successive loops associated with the same needle in successive knitting cycles. 

Simple way to remember

Wale = Vertical

Think of wales as the columns in a grid.

●   ●   ●   ●
●   ●   ●   ●
●   ●   ●   ●
●   ●   ●   ●
↑   ↑   ↑   ↑
Wales

The actual knitted structure is made from intermeshed loops, so this is only a simplified visual representation.

What Is a Course in Knitted Fabric?

A course is a predominantly horizontal row of loops running across the width of knitted fabric.

If you follow a row of loops from one side of the fabric to the other, you are following a course. 

Simple way to remember

Course = Horizontal

Think of courses as the rows in a grid.

→ → → → →  Course
→ → → → →  Course
→ → → → →  Course

Courses and wales together describe the basic arrangement of loops within knitted fabric.

Wale vs Course: What Is the Difference?

The easiest way to understand the difference is direction.

Educational textile references similarly define wales as vertical columns and courses as horizontal rows of knitted loops. 

Why Do Wale and Course Matter to Fabric Buyers?

Wale and course are not just technical knitting terms.

They help describe the structure and density of knitted fabric.

The number of wales and courses within a given length can influence the fabric's construction and appearance. Together, wale and course density are used in determining stitch density.

For a buyer, this can become useful when comparing two knitted fabrics that appear similar but have different construction characteristics.

What Is Wale Density?

Wale density refers to the number of wales within a specified length of fabric.

It is commonly expressed as:

Wales per Inch (WPI)

or

Wales per Centimetre (WPC).

For example, if a fabric specification states a particular WPI, it indicates how many wale columns occur within the specified measurement length.

Textile manufacturing references use WPI or WPCM to describe wale density. 

What Is Course Density?

Course density refers to the number of courses within a specified length.

It can be expressed as:

Courses per Inch (CPI)

or

Courses per Centimetre (CPC).

Course density therefore tells you how many horizontal rows of loops occur within the specified measurement length. 

Wale Density + Course Density = Stitch Density

A useful concept for understanding knitted fabric is stitch density.

In basic terms:

Stitch Density = Wale Density × Course Density

For example, if a fabric has:

30 wales/inch × 40 courses/inch

then the basic stitch-density calculation would be:

30 × 40 = 1,200 loops/in²

Textile educational material describes stitch density as the product of wales per unit length and courses per unit length. 

However, buyers should not treat this number alone as a complete measure of fabric quality.

Does Higher Wale Count Mean Better Fabric?

Not necessarily.

A higher wale count does not automatically mean that a fabric is better.

Fabric performance depends on multiple factors, including:

• Yarn
• Fabric construction
• Loop length
• GSM
• Finishing
• Fabric density
• Fibre composition
• Knitting parameters
• Intended application

A fabric with a particular wale and course density may be suitable for one garment but unsuitable for another.

Therefore, don't use wale count alone to decide fabric quality.

Does Higher Course Count Mean Better Fabric?

Again, not necessarily.

Course density is one part of the fabric construction.

The appropriate course density depends on what the manufacturer is trying to achieve in terms of:

• Fabric weight
• Structure
• Appearance
• Handle
• Stretch
• Stability
• End use

Therefore, course count should be considered alongside the other fabric specifications.

How Wale and Course Look on a Knitted Fabric

If you examine a knitted fabric closely, you can identify two directions.

Vertical direction

Follow the columns of loops.

These are the wales.

Horizontal direction

Follow the rows of loops.

These are the courses.

A simple way to remember it:

Wale = Column
Course = Row

This is one of the easiest ways for new fabric buyers to understand knitted fabric structure.

Are Wale and Course the Same as Warp and Weft?

No.

This is an important distinction.

In woven fabrics, the two main yarn directions are generally described as warp and weft.

In knitted fabrics, the loop structure is described using terms such as wales and courses.

A wale is a column of knitted loops, while a course is a row of knitted loops. 

So avoid saying:

Wale = Warp

or

Course = Weft

as if they were directly equivalent.

They describe different textile structures.

Wale and Course in Weft Knitting

In weft knitting, yarn is fed to form successive loops across the fabric.

The resulting fabric still contains both:

• Wales
• Courses

The course direction represents the successive horizontal rows of loops, while wales form the vertical columns. 

Many common knitted apparel fabrics are produced using weft-knitting processes.

Wale and Course in Warp Knitting

Warp-knitted fabrics also contain wales and courses.

However, the way the yarns move through the structure is different from weft knitting.

In warp knitting, multiple yarns are supplied lengthwise, and the yarns form loops while moving between neighbouring wales.

Therefore:

Both warp knitting and weft knitting have wales and courses.

The terms describe the knitted structure rather than defining only one knitting method.

How Wale and Course Affect Fabric Structure

The relationship between wale and course density contributes to the overall knitted structure.

It can be associated with differences in:

• Fabric density
• Surface appearance
• Dimensional behaviour
• Fabric handle
• Stretch characteristics
• Stability

However, these properties are also affected by other knitting variables, particularly loop or stitch length, yarn characteristics and fabric construction.

Therefore, buyers should avoid judging a fabric from wale and course counts alone.

Why Buyers Should Understand Wale and Course

Imagine you receive two fabric samples.

Both have:

• Similar colour
• Similar GSM
• Similar composition
• Similar DIA

Yet they don't feel or behave exactly the same.

The difference may come from several construction variables, including how the knitted loops are formed and arranged.

Understanding wale and course gives you another way to discuss the actual fabric structure with your supplier.

Instead of simply saying:

"This fabric feels different."

you can discuss the construction and ask for the relevant technical specifications.

How to Check Wale and Course on a Fabric Sample

You don't necessarily need complicated equipment to understand the basic direction.

Step 1: Take the fabric sample

Place it flat on a clean surface.

Step 2: Identify the fabric length

Use the finished fabric direction as your reference.

Step 3: Look for vertical columns

The columns of loops running predominantly along the length are the wales.

Step 4: Look for horizontal rows

The rows running predominantly across the fabric are the courses.

Step 5: Count within a defined measurement

For technical evaluation, count the wales and courses within a specified measurement length.

For production-critical requirements, use an agreed testing method and measurement condition rather than relying on visual estimation.

What Is the Relationship Between Wale, Course and GSM?

This is where buyers need to be careful.

GSM tells you the mass of fabric per square metre.

Wale and course describe aspects of knitted loop arrangement and density.

They are therefore different measurements.

For example:

A proper fabric specification should not rely on GSM alone.

Wale and Course in Common Knitted Fabrics

You may encounter these concepts when dealing with fabrics such as:

• Single Jersey
• Interlock
• Piqué
• Rib
• Mesh
• Other knitted constructions

However, the exact appearance and structure of the wale and course can vary significantly depending on the knitting construction.

For example, a simple Single Jersey structure will look different from an Interlock or Rib structure.

Therefore, don't assume that all knitted fabrics have the same visible loop pattern.

Does Wale and Course Affect Stretch?

They can contribute to the structural behaviour of a knitted fabric, but wale and course counts alone do not determine stretch.

Stretch can also be influenced by:

• Fibre composition
• Yarn characteristics
• Loop length
• Knitting structure
• Fabric finishing
• Elastane content where applicable
• Fabric tension and relaxation

Knitted fabrics generally obtain their characteristic extensibility from their looped structure. 

For buyers, the practical lesson is simple:

Don't predict stretch from wale or course count alone. Test the actual fabric.

Wale, Course and Fabric Quality

It is tempting to think:

More wales + more courses = better quality.

That is too simplistic.

Fabric quality should be evaluated according to the intended application.

For example, a lightweight sports T-shirt may require different construction characteristics from a structured polo or a heavier garment.

A good fabric is one that meets the required specification and performs correctly in the intended garment.

What Should Buyers Ask Their Fabric Supplier?

If wale and course information is important for your product, ask your supplier for:

• Fabric construction
• GSM
• DIA / finished width
• Composition
• Wale density, where relevant
• Course density, where relevant
• Stitch density, where relevant
• Loop/stitch length, where relevant
• Finishing details
• Stretch and recovery, if applicable
• Shrinkage
• Colour fastness
• Available colours
• MOQ
• Repeat availability

Not every commercial fabric quotation will list every knitting parameter, so ask for the parameters relevant to your application.

A Simple Example for Buyers

Suppose you are comparing two knitted polyester fabrics.

Fabric A

• 160 GSM
• 60 DIA
• 30 WPI
• 40 CPI

Fabric B

• 160 GSM
• 60 DIA
• Different knitting construction

Even though both fabrics have the same GSM and DIA, they may still differ in:

• Hand feel
• Surface appearance
• Stretch
• Structure
• Drape
• Stability

This is why GSM + DIA alone may not completely describe a knitted fabric.

The construction and other technical parameters also matter.

Common Mistakes Buyers Make

Mistake 1: Thinking Wale Means GSM

Wale and GSM describe completely different things.

Wale = knitted loop column

GSM = fabric mass per square metre

Mistake 2: Thinking More WPI Means Better Quality

Higher wale density does not automatically mean higher quality.

Always relate the specification to the intended garment.

Mistake 3: Confusing Wale With Warp

Wale and warp are not interchangeable terms.

Wale describes knitted loops; warp describes a yarn direction in woven structures.

Mistake 4: Ignoring Course Density

Looking only at wale density gives an incomplete picture of the knitted structure.

Where relevant, consider both wale and course density.

Mistake 5: Comparing Fabric Only by GSM

Two fabrics can have similar GSM but different construction and performance.

Always evaluate the complete specification.

A Practical Fabric-Buying Checklist

Before approving a knitted fabric, consider:

Basic Specification

• Composition
• GSM
• DIA / finished width
• Construction
• Colour

Knitted Structure

• Wale density, where relevant
• Course density, where relevant
• Stitch density, where relevant
• Loop/stitch length, where relevant

Performance

• Hand feel
• Stretch
• Recovery
• Drape
• Breathability
• Shrinkage
• Colour fastness

Production

• MOQ
• Price
• Available colours
• Lead time
• Repeat availability

This gives you a more complete picture before placing a bulk order.

Frequently Asked Questions

What is a wale in knitted fabric?

A wale is a predominantly vertical column of successive loops in a knitted fabric.

What is a course in knitted fabric?

A course is a predominantly horizontal row of loops across a knitted fabric. 

What is the difference between wale and course?

Wales run predominantly vertically along the fabric length, while courses run predominantly horizontally across the fabric width.

What is WPI?

WPI means Wales Per Inch. It indicates the number of wale columns within one inch of the specified fabric measurement.

What is CPI?

CPI means Courses Per Inch. It indicates the number of course rows within one inch of the specified fabric measurement.

Does higher WPI mean better fabric?

No. WPI is a construction parameter, not a standalone quality rating.

Does GSM determine wale and course?

No. GSM and wale/course density are different fabric parameters. A fabric's GSM is influenced by several structural factors, including yarn and loop characteristics.

Are wale and course used for both warp and weft knitting?

Yes. Both warp-knitted and weft-knitted structures contain wales and courses, although the yarn formation and movement differ between the two systems. 

Why should a clothing brand understand wale and course?

Understanding these terms helps buyers communicate more accurately about knitted fabric construction and evaluate technical specifications beyond GSM, DIA and price.