Flat lock stitch for comfort and durability. Exclusive thumb loop at base of zipper for easier on and off. Features O-ring seals at wrists and ankles. Super-flexible Thermoskin. Top-quality YKKTM zippers and zipper flaps minimize entry of water penetration and don't hang up. Vulcanized rubber kneepads deliver maximum flexibility, durability and cushioning. Suits are cut in the swim position for more flexibility and comfort. Sized to fit most body types and water-sport needs.