The first time we ever wore Merino wool, we were pleasantly surprised at how soft and comfortable it was. We'd always thought of wool as scratchy, but Merino is different. Aside from this remarkable softness, Merino wool also has the desirable quality of a wide comfort range. What this means to you is that it has plenty of insulative power to keep you warm on chilly days while still possessing a comfort range that allows you to wear it even when you might not have normally reached for a baselayer for fear that the afternoon temperature on your long ride may be too much. Rest assured that you can start out in cold and ride home in warmer temperatures, and the Merino Wool in this baselayer will keep you comfortable.The Castelli Merino Wool LS Baselayer is cut from almost impossibly soft Australian Merino wool. You can be excused for thinking Castelli cut this from Cashmere, but it really is Merino. And because wool won't hold odors no matter how hard your ride was, it makes for excellent apres-ride wear. The crewneck cut means it will fit comfortably beneath a long-sleeve jersey or a jacket. While not truly form-following, it does offer a tailored cut that won't cause it to bunch up underneath your jersey. The flatlocked seams ensure your comfort and the durability of the garment. Flocked Castelli labels appear at the neck and lower back to show off your style. The Castelli Merino Wool Long Sleeve Baselayer comes in Black and in six sizes from X-Small through XX-Large.