I have a pair of Duck Feet fins on the way as one my UDTs has a split in the strap where it meets the foot box. They are still working fine but just in case you know. The other factor is wearing the UDTs has resulted in injuring my feet a little. I have been in the habit of wearing a pair of low cut fin socks covered by a pair of high cut ones of the same size rather than a size bigger which would have probably have meant that the issue never arose in the first place. Duh! My feet have ended up all squashed up inside the foot box and the ball of my big toe on the right foot particularly has been quite painful to walk on. I have resolved the situation by wearing just the high cut socks and after a long session on the MT5 yesterday and thinking I might be in trouble the next day they have felt pretty reasonable. So I will be doing a comparison reviewing the smaller Duck Feet against the UDTs soon. Although I love the power of the UDTs, many other matters far more experienced than myself use the Duck Feet so I may end up using them instead also. My toes are definitely more knobbly from using fins over the last year! Anyone else had foot problems due to long term fin usage?