Explore the most-loved boxer briefs, thermal underwear sets, undershirts, tank tops, training pants, etc., from leading brands at slashed prices. Starting in 1968, Calvin Klien is one of the leading fashion brands in the world. It particularised in different types of clothing which include jeans, coats, daily wear, sportswear, and other collectibles. Gray is the perfect combination of dark and light colors. Our fashion experts have curated Calvin Klein Gray Underwear for boys in variety of fabric type like Cotton, Blend and Microfiber. Shop easier with our multiple store options.