Tesla Compression Heat Tech Crew Neck Short Sleeves Under Base Layer Tops 92% Polyester/8% Spandex Imported Material : 92% Polyester & 8% Spandex Smooth Fabric - Provides extreme comfort and compression without restriction The Streamlined compression system provide more compression to hips and back for stability to the core area of the body. Dry-zone features fiber nanotechnology incorporating antibacterial silver dioxide for antibacterial freshness and titanium oxide for UPF 50+ UVA/UVB sun protection. Country of Manufacture : Vietnam