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. The 3D Knit technology ensures an unrestricted range of motion and lasting durability. Lightweight and breathable, it's perfect for any active lifestyle.