Sil2 Breathable Silicone Technology in the flange. Which means it sticks with a unique siliocne adhesive that seals perfectly to protect skin against output and moves with your body so it feels like it's not even there. Made with a water resistant material, leaves the bag dry to the touch, ideal for being active, swimming, showering and bathing. High performance carbon filter manages air in the bag to reduce ballooning, pancaking and odour.