Hot Chillys Men's Mec Ankle Tight Lycra,Polyester Made in USA A blend of 90% MTF micro polyester, Bio-Silver polyester and 10% spandex, which is lightly sanded for comfort and performance. A blend of 90% MTF micro polyester, Bio-Silver polyester and 10% spandex, which is lightly sanded for comfort and performance.|Covered elastic waistband for added comfort|Flat seam construction to reduce bulk & abrasion|Gusset eases movement and reduces seam bulk|