Mill Terminology: Yarn Construction Types and Their Characteristics
Yarn construction types refer to the spinning and plying techniques mills use to create finished yarn from raw fibre. The main construction types include bouclé, high twist, twist on twist, singles, cable yarn, crepe, chainette and roving. Each construction affects how a yarn feels, wears, and behaves in knitting and crochet — influencing stitch definition, durability, drape, and resistance to pilling.
Beyond ply count and twist direction, mills use a rich vocabulary to describe how a yarn is constructed and finished. Understanding these terms helps you predict how a yarn will behave in your hands and in your finished project.
Quick Reference: Yarn Construction Types at a Glance
| Construction Type | Key Characteristic | Best For | Pilling Resistance |
|---|---|---|---|
| Bouclé | Looped, textured surface | Statement pieces, visual interest | Moderate |
| High Twist | Firm, bouncy, crisp definition | Cables, lace, textured patterns | High |
| Twist on Twist | Extremely dense and durable | Socks, hardwearing garments | Very High |
| Singles | Soft halo, rustic look | Drape-focused projects, accessories | Low |
| Cable Yarn | Round, smooth, stable | Aran knitting, Guernsey wools | High |
| Crepe | Bouncy, elastic, crisp hand | Superfine merino, everyday garments | Very High |
| Chainette | Light, drapey, hollow core | Luxury fibres, cashmere blends | Moderate |
| Roving | Unspun, cloud-like softness | Decorative pieces, wall hangings | Low |
Bouclé
What is bouclé yarn? Bouclé (from the French for "buckled" or "curled") is a yarn with a looped, textured surface. It's created by feeding one strand faster than another during plying, causing the faster strand to form loops around the core.
The result is a highly textured yarn that creates a nubby, tactile fabric. Bouclé is beautiful for statement pieces but can be challenging to work with — the loops can make it difficult to see individual stitches, and it doesn't frog (unravel) easily. It adds warmth and visual interest, and the loops trap air, making it surprisingly lightweight for its apparent bulk.
High Twist
What is high-twist yarn? A high-twist yarn has more twists per inch than a standard yarn of the same weight, producing a firmer, more durable yarn with excellent stitch definition.
High-twist yarns are ideal for cables, lace, and textured patterns where you want the structure of each stitch to be clearly visible. They tend to be slightly less soft against the skin than low-twist alternatives, but they wear exceptionally well and resist pilling. They also have a characteristic slight springiness or "bounce" when you squeeze them.
Twist on Twist (Plied High-Twist)
What is twist-on-twist construction? Twist on twist involves plying already high-twist singles together with additional twist applied during the plying process, creating an extremely firm, dense yarn with outstanding durability.
This construction is common in traditional sock yarns and hardwearing work yarns. The high energy in the yarn can cause it to bias (lean to one side) in stockinette stitch — a characteristic that experienced knitters manage through pattern choice or by alternating skeins.
Singles (Single Ply)
What is a singles yarn? A singles yarn is spun but not plied — it's a single strand of twisted fibre with a characteristic halo and softness.
Singles yarns can produce a beautifully rustic or artisan aesthetic. However, they are less durable than plied yarns, more prone to pilling, and can bias in knitted fabric. They're best suited to projects where drape and texture are prioritised over longevity.
Cable Yarn
What is cable yarn construction? Cable construction involves plying plied yarns together — for example, taking two 2-ply yarns and plying them together to create a 4-ply cable yarn.
This produces an extremely round, smooth, and stable yarn with very high durability. Cable yarns are common in traditional Aran and Guernsey wools. The multiple layers of twist balance each other out, resulting in a yarn that lies very flat and even in the fabric.
Crepe
What is crepe yarn construction? Crepe construction uses a high-twist spinning technique where individual singles are spun with significantly more twist than conventional yarns, then plied together to create a bouncy, elastic yarn with excellent resistance to pilling.
The high twist energy trapped in the fibre creates a yarn that springs back when compressed, giving it a lively, resilient feel. Crepe yarns produce outstanding stitch definition — cables and textured patterns appear sharp and well-defined — while the tight twist structure helps the yarn maintain its appearance over time. This construction is particularly valued for superfine merino yarns, where the crepe twist enhances durability without compromising softness. The Bendigo Woollen Mills Whisper range uses crepe construction across both their 4ply and 8ply lines.
Chainette / Hollow Core
What is chainette yarn? Chainette yarns are constructed using a knitting machine to create a hollow, tube-like structure rather than twisted plies, resulting in an exceptionally light and drapey yarn.
Chainette construction is resistant to splitting (since there are no individual plies to separate) and is increasingly popular for luxury fibres like cashmere and silk blends, where drape is paramount. The hollow core also means the yarn compresses easily and springs back, giving a soft, airy hand.
Roving and Unspun Yarns
What is roving yarn? Roving is fibre that has been carded and drawn into a continuous rope but not yet spun. Some products sold as "roving yarn" are very lightly twisted — just enough to hold together for knitting or crochet.
These yarns are extremely soft and have a beautiful matte, cloud-like appearance, but they are fragile and not suitable for high-wear items. They're best used for decorative pieces, wall hangings, or very gently-used accessories.
Frequently Asked Questions
Which yarn construction is best for stitch definition?
High twist, cable, and crepe constructions all produce excellent stitch definition. High twist yarns give crisp, visible stitch structure ideal for cables and lace. Cable yarns are round and smooth, making them perfect for traditional Aran patterns. Crepe yarns combine high twist with elasticity, producing sharp definition while maintaining softness.
Which yarn construction resists pilling the most?
Twist on twist and crepe constructions offer the highest pilling resistance, followed by high twist and cable yarns. The tight twist structure in these constructions locks fibres in place, preventing the friction that causes pills to form. Singles and roving yarns are the most prone to pilling.
What's the difference between singles and plied yarn?
A singles yarn is a single strand of twisted fibre with no plying. Plied yarns have two or more singles twisted together, which increases durability, stability, and resistance to pilling. Singles offer a softer, more rustic aesthetic but are less hardwearing.
Is crepe construction the same as high twist?
Not quite. High twist refers to any yarn with more twists per inch than standard. Crepe is a specific technique that uses high-twist singles plied together, creating a bouncy, elastic yarn. All crepe yarns use high twist, but not all high-twist yarns are crepe.
Understanding the language of yarn construction gives you the tools to make informed choices about the yarns you buy and use. At Skein Machine, we're passionate about helping you find the right yarn for every project. If you have questions about any of the yarns in our range, don't hesitate to get in touch.
