I've never noticed the Impact Gels getting stiff in the winter. The Professional's Choice pads, yes, although they warm up just fine as soon as you saddle the horse. But I never noticed that with the Impact Gels. Maybe it depends on your climate. It doesn't get much colder than the teens here, and I probably never ride in weather colder than the mid 20's. The Impact Gels have held up great for me for several years now.