Patent ID: 6955575

Claim:
A flipper comprising: a skeleton structure including a rear base portion, a side rail forward extended from each lateral outer side of said rear base portion in a longitudinal direction of said flipper, and a plurality of spaced supporting strips forward extended from a rear inner side of each said side rail in a substantially longitudinal direction; and a web structure including a foot pocket associated with said rear base portion of said skeleton structure to locate above said rear base portion, a sheathing forward extended from each lateral outer side of said foot pocket in a longitudinal direction for wrapping said side rail of said skeleton structure therein, and a plurality of longitudinally extended webs provided between said two sheathings to locate between and connect two said supporting strips that are adjacent to each other as well as said side rails and said supporting strips; wherein each of said side rails of said skeleton structure is provided along a longitudinal outer side with a sideward projected portion, which is projected from an outer side of said sheathing of said web structure.