It is a type of material that stretches and is used especially for making clothes fit tightly.
Badger 4280 - Poly/Spandex 1/4 Zip Lightweight Pullover
Swannies SWCJ600 - Coleman Jacket
Swannies SWE400L - Women's Ellis Pullover
Fairway & Greene F12250 - Women's Wells Quarter-Zip Tech Pullover
Flexfit 6477 - Wooly Blend 6-Panel Cap
Weatherproof 6500 - Soft Shell Jacket
Fairway & Greene C11512 - Caves Quarter-Zip Tech Pullover
Glyder PDP6789 - Women's Vintage Oversized Crew Pullover