Used my for the first time on sunday. thought they were great but i do have a few questions. my right boot hurt my foot around the heel. i losend them up a little and they still hurt. then i opend the valve and sucked as much air out as i could and it felt better. i know you are not supposed to open the valve unless jumping out of a plane, but fishing in colorado i start out at 5,000ft. and drive to the lake at 9,000 ft. should i open the valves? aslo there is a lot of talk about the MM boots getting dry rott. what is this? how do i prevent it? are there any storing tips i should do when i put them up for the summer? thanks for al the info.