Keen no longer makes the water shoe style I had and the new versions only have a strap in back. but at £140 per pair cheaper. The iOS controls work with iPhone 7s lightning port. I would love to see these in more colors for wide sizes! I am incredibly frustrated and to purchase a SMALLER size, it?s more expensive. So i ordered this product and almost loved it 100%, there was one flaw. and it is working. Can feel rocks through the sole - which is okay when scrambling, but can be painful / tiring on a long day of talus hopping. Have used these for around 12 hours I guess so far and I havent had a drop out once. It?s a soft feeling silicone or silicone-like material and should feel comfortable on the skin for those that plan to use it.