Power without compromise. The Hollis fin blends graceful movement, power, and bulletproof construction. Meet the new standard in diving. High grade, heavy duty rubber construction Angled strap mounts for comfort and a better transition of power Spring heel straps w/ easy-grip heel tab Multiple strap mounting positions for a fine tuned fit Vented blade to reduce stress while accelerating water over the blade Generous foot pocket Power without compromise. The Hollis fin blends graceful movement, power, and bulletproof construction. Meet the new standard in diving. Sizing Guide: LG = Regular (Mens 7-9)XL = XL (Mens 10-12)2XL = XXL (Mens 13-15) REGULAR (LG) XL XXL 7-9 10-12 13-15