The loops of knit fabrics produce a structure that reacts quite differently from woven structures of the same fiber content and yarn size. In general, warp knits are more stable, have good dimensional instability than weft knits and are less prone to snagging. General care precautions for knits are more applicable to weft knits than to warp knits. Instructions on the care label of any knit item should be closely followed to derive maximum performance.
The knit structure is usually less prone to wrinkling than a woven structure. Knit garments are often called "the original easy-care apparel". Ironing is seldom needed, but when touch-up pressing is required, care should be taken not to distort the fabric by pulling it.
Tumble-drying may cause excess shrinkage in some knits. The loops in a weft knit structure may become distorted during tumble-drying. Many knit items are labeled with precautions against hanging the product. As it hangs, the mass of the fabric elongates and distorts the loops to pull the fabric out of shape. Again, weft knits are less prone to such distortion. Laying knit items flat and drying flat avoids the problem of distortion of the yarns and stretching out of shape.
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