Nike Double Up Racerback Tankini Top Size XLNike Double Up Racerback Tankini Top Size XL The madness of summer descends and you need armor against the savage sunthis Nike racerback tankini rises to meet the challenge with the kind of brutal efficiency that would make a military quartermaster weep with joy. Polyester and elastane twisted together in some laboratory nightmare, engineered for maximum movement while the ocean tries to drag you under. Blue as a desert mirage, built like a tank,