This is the XS Scuba Hypos Fin Long Blade Freediving Spearfishing Fins Features: These bi-material fins offer comfortable TPR rubber full foot pockets and flex-polymer blades They can be worn barefoot, or with lycra, polyolefin or thin neoprene socks. Channels running the length of the blade reduce lateral movement and help with tracking The fishtail shape helps guide the fin through the water Lightweight and float The Hypos freediving fins are ideal for novice to intermediate freedivers and those taking their first freediving class. They overcome that expensive barrier-to-entry posed by carbon fiber fins. These fins are lightweight, stable in the water and get the job done.