Rapha Men's Merino Base Layer - Long SleeveElite cyclists know base layers are as flexible as they are necessary. Keeping you cool in summer and warm in winter, Raphas Merino under vests wick moisture superbly and are extremely odour resistant. Any experienced cyclist knows the value of a good base layer. It will keep you cool on scorching hot cols in July and warm on freezing descents in January. A good base layer helps regulate body temperature whatever the weather, transfering moisture from