Aqua Sphere Men's Winter Aqua Skinsuit Armpit panels are designed to help encourage a natural swimming movement Flat lock stitching allows for natural body movement when swimming 1mm "Dura Glide skin" is warm water repellant and quick drying Athletic cut, close to the body to maintain a compression effect Collar is designed with glide skin material to limit water entry; Long back zipper makes the suit easy to get in and out