Rib fabrics from cotton and cotton-blend yarns were treated to a variety of relaxation treatments. Cotton fabrics undergo greater wet relaxation shrinkage than synthetic fiber fabrics, while hot dry treatments have the opposite effect. Blends of cotton and synthetic fibers produce "u" values between high and low values of the 100% fabrics, while relaxation shrinkage is very fiber-sensitive. Consolidation shrinkage appears to be independent of the blend constitution of cotton polyester fabrics. Cotton rib fabrics attain similar "u" values to those reported for wool fabrics.
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