MARATHON SESSIONSOuter material: CHAMPION STRETCH - 93.2% recycled Nylon, 6.8%of SpandexNeoprene: MAX SUPER-STRETCH NEOPRENEInner material: PRIMALOFT WARM - 37% polyester, 7% Spandexrecycled, 56% recycled polyester PrimaLoftConstruction: Surf capThickness: 2 mmOpening system: Slip-onExternal seam detail: GBSAqua Alpha glue details - water-basedComposition93.2% Recycled Nylon, 6.8% Spandex