3 pack of black trunks. Calvin Klein Underwear, curated by Reiss, is a collection of lingerie designed to elevate the underwear drawer and work perfectly beneath your existing Reiss garments. Feel comfortable from the first layer. These best-selling black trunks are crafted from a cotton-elastane blend for everyday comfort. They’re cut to medium rise on the waist and feature the brand’s signature monogram waistband in white. three packs of black trunks. Cotton-elastane blend. Medium rise. Signature monogram waistband.