I have had my monofin for a about 5 years and it has served me well, I mostly use it in the pool and freediving North California with no socks but I recently moved to Alaska and it would be great for diving out here, but the water would be way to cold for no socks. My problem is I can not wear the fin with socks, it fits very tight on my feet and I have to use electric tape on my toes to prevent blisters. Is there any way to replace my foot pockets for the next size up?