Calvin Klein Underwear understands that not all fabrics work well for every occasion - this sampler pack has three different types of boxer briefs to cover all the bases. The microfibre pair is really sleek and breathable, so you can treat it like activewear, while the stretch-cotton style is great for every day and the modal and cotton-blend version is so comfortable to sleep in. Each one has a supportive fit and elasticated logo-jacquard waistband.