In the bad old days, if you had MS or another heat-sensitive disability, you had to either sit inside an airconditioned space or wear a cooling vest. But today breathable, moisture-wicking fabrics are readily available. Brands like Columbia, UnderArmour and Patagonia still have the best offerings for tops and bottoms, but even Hanes now offers cooling T-shirts, underwear and socks. Look for the words moisture-wicking or cooling. For the science behind these synthetics, check out the International Sports Sciences Association’s “Cotton Vs. Synthetics: Why the Natural Choice May Not be Cotton,” issaonline.com/blog/index.cfm/2017/cotton-vs-synthetics-why-the-natural-choice-may-not-be-cotton.