I've been using splits for rec diving but due to beginning tech classes, I bought a pair of paddles (Jets design, IST specifically) and tested them. They were fine in the test dive but seven dives for 10 hours over three days beat my toes to pieces with abrasions on the tops of three toes. I feel like I'm pushing a lot more with my toes and am wondering if it's because this design doesn't cover the heel or maybe if the foot pocket is too tall or if it's something with my technique and the fins aren't "broken" at all.