Using 4mm DuraFlex neoprene and GBS seam technology the FLUX Boot offers added protection for use in colder waters. Still packed full of features like our shoes the FLUX Boot combines ankle support, warmth and flexibility with unique features like the angle instep and finger loop for functionality. Features: Internal Split Toe Angle Instep Arch Strap Vulcanised Footpads Finger Loop Heal Stabilizer GBS Seams Mesh Carry Bag