Women's Baselayer Running Undershirt White, Small shirt helps wearers stand a little taller and sit a little straighter. It's designed to improve posture with a corrective crisscross back design, which adds lumbar support toÃÂ win the approval of strict finishing school teachers. As it corrects, it also slims, moulding oblique's and lasts to fight love handles and helping abs look toned with washboard slimming panels. Firming fibre technology performs an instant tummy tuck. The shirt's form-fitting design can be worn beneath everyday clothing, from weekend T-shirts to workday button-ups, without adding bulkiness.