IST Super S Fins

The combination of super comfortable foot box and stiff fin (1" deflection with finger before high resistance) is perfect for me. For those considering buying the XXL or 13-16 size, here's some specs: Overall length from back to tip of fin: 22.5". 7.75" across at top. Foot box is 11" long from heel to front opening for toes. That toe opening is 3" across and 7/8" high. In foot area the box is 3" across without stretching and 3.5" high by 4" long to where it enters enclosed sector. For my size 13 foot the fit was excellent. Did need exertion to get foot in. I forecast that a size 16 foot would require a lot of effort and strength to get foot in.