Hyperflex VYRL 3mm Bootie using the VYRL CRYO 7 and VYRL 5MM boots as inspiration, Hyperflex designed the VYRL 3MM boot using a soft and minimal design approach. This and light weight are the predominant words here. The boot provides all the necessary warmth while maintaining the best barefoot feel available. Features 100% lines with Fire Fleece the same great retaining lining used in the 5/4 winter suits. Fusion Welded seams 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. Internal split toe to avoid snagged leashes.