Really warm one-pice underwear to be worn under a dry suit. The Halo 3D has a body mapped insulation, strategically placed to enhance protection when in horizontal trim. Additional protection in strategic areas made of the SPACETEK material. Extra fleece keeps your back, kidney region, buttocks and hamstring region protected. Thumb Loops on the sleeves make donning a dry suit on top of the Halo 3D easy. There is a useful pocket in the right arm is ideal for small valuables. P-valve holes are located at the inner thigh on both legs so the user can select the preferred leg for routing the catheter.