One suit to warm it all: CarharttA(R) Classic Union Suit. Waffle knit low-piling yarn traps body heat to keep you warm all over. But this isn't your granddad's union suit. Rugged Flex cotton/polyester comfortably moves with you in all directions. Adding to your comfortable wear are smooth flatlock seams, tagless label, and concealed Y-stitch waistband. And for your convenience, yes, there is a back opening. Wear this as a base layer, when camping, or simply around home on a cool day. 150 GSM 5.3-oz. 60/40 cotton/polyester Rugged Flex 4-way stretch moves with you wherever you go Waffle-knit low-piling interior retains body heat to keep you warm Smooth flatlock seams, strategically placed for maximum comfort and reduced chafing Back opening with elastic waistband tuck closure for added convenience Concealed, comfortable Y-stitch waistband Concealed thumbholes Snap front Logo on chest Crew neck Order today!