Designed using 5mm X-FLEX neoprene and fx:lite lining, the Gul Power Boot spllit toe is super warm yet flexible. Reinforced heel and toe for durability. BLINDSTITCHED: Seam construction X-FLEX: 150pct super stretch FX:LITE: silky smooth, hydrophobic ( i.e. doesn't hold H2O ) material H10: bare foot feel sole LEASHGUARD: prevents leash jams Velcro adjustable ankle straps for secure fit