Sealed Warmth and Durability. If you&';re looking for the perfect balance of warmth and performance for a great price, the HydroFlex Series is the perfect fit. This Dive series offer ThermoLite IR lining which generates infrared warmth, Ultra Stretch panels for added comfort, sealed wrist and ankle cuffs, completely sealed seam construction, compression resistance eco foam. ThermoLite IR Ultra Stretch Triple Glued and Blind Stitched Compression Resistant Eco Foam Sealed Wrist and Ankles cuffs Engineered Fit