For all my friends living in hot climates the HD (sorry) Circulator Seat Pad is a game changer. Put it on my Vision and rode for 2 hours today in 104 degree heat. Normally a miserable ride and today it felt great. Seat actually feels like it is cooling your rear end. Combine that with a hydration vest and you may be too cold to ride. $85. Have to take seat off, at least on the Vision to secure, and pad stays in place. I got the medium and it is a great fit.