Made with neoprene-free 85% Yulex® natural rubber/15% synthetic rubber (by polymer content) that meets our rigorous standards for performance, durability, warmth and sustainability; the natural rubber is derived from sources that are Forest Stewardship Council® certified by the Rainforest Alliance; the synthetic rubber is chlorine-free High-stretch 100% recycled polyester jersey lining throughout improves flexibility and dry time; exterior face fabric made with 88% recycled polyester/12% spandex is durable, stretchy and water-resistant Seams are sewn with flatlock construction for comfort and durability Princess seams with racerback detailing Easy-access key loop Material 2mm 85% Yulex® natural rubber/15% synthetic rubber by polymer content, lined with high-stretch 100% recycled polyester jersey; exterior face: 88% recycled polyester/12% spandex. Natural rubber is from sources that are Forest Stewardship Council® certified by the Rainforest Alliance