Shop boys' underwear in red, blue, green, yellow, gray, and many more interesting colors. Amazon essentials is an online clothing brand offered by Amazon. It is a clothing line with basic wear for men, women, kids, and babies. They also have a wide variety of clothes to select from. Navy Blue is a darker shade of blue, loved by both men and women. Discover the incredible savings on Underwear ranging from Everyday and Casual. Check the product details to find eligibility for free shipping and free returns.