Hyperflex VYRL CRYO 7mm Boot Built to take on the frozen North Atlantic, Great Lakes and Pacific Northwest. The CRYO is the real deal of winter gear. Built using the same materials used in the Hyperflex CRYO winter suits series. Features 100% lined with Fire Fleece the same heat retaining lining used in the CRYO 6/5 and 5/4 winter suits. Fusion welded seams. Square toe box design Locking internal skin entry cuffs. Dual axis instep strap allows for maximum torque and comfort adjustments. Integrated Multi-layer sole, heal and toe layers are vulcanized as a unit to provide maximum support while not compromising flexibility. Wide finger loop above heel for easy on and off.