BRANWYN Essential Racerback Sports Bra Review by Erin Trail Features Compressive, seamless, 4-way stretch knit support utilizing our proprietary POWRspun Merino tech, consisting of 76% extra fine ZQ Merino, 14% nylon, and 10% elastane. A soft, wide waistband offers comfortable coverage that won’t dig in or slip down. Super-stretchy fabric holds its shape as you…