Trek Fins are the most popular snorkeling fins and are "Travel-Ready" in compact size, only 15" in length. * Quad flex rail system channels water and provides excellent snap * Soft, flexible foot pocket for great comfort & no boots required and will NOT fit wide feet. * Our pair of Trek Fins come with a padded heel strap for more comfort * Small (Mens 4-7 & Ladies 5-7.5); Medium (Mens 7.5-10 & Ladies 8-10); Large (Mens 10-12 & Ladies 10.5+)