3D Knit features Hot Chillys' Mtf polyester and Silvadur antimicrobial yarns for smooth, easy layering. Silvadur Intelligent Freshness protects against unwanted bacteria and odors so fabrics stay fresher, longer, with fewer launderings. Four-way stretch hugs the body, moves with you, and provides endless, sleek support. It also wicks moisture away from your skin to keep you dry and comfortable, no matter what your activity.