Stella McCartney has an oracle-like affinity for designing workout pieces you never knew you needed but now can't live without. Flattering and practical, the TruePurpose Midlayer Jacket is a shining example of this fact. ​ ​ Chilly mornings provide ample excuses to stay under the covers, but once you are ensconced in this sumptuous and buttery soft top you'll have no trouble getting out of bed. Made for a second-skin fit, it will flatter your unique shape without feeling overly tight or constrictive. ​ ​ Designed for cold-weather cardio, the midlayer is crafted from sweat-absorbent AEROREADY fabric that will keep you dry in and out of the studio and features a sleek ribbed collar for additional warmth. Mesh detailing and laser-cutting were designed to provide much-needed insulation. ​ ​ The thumbholes will prevent the top from slipping up while you work out and will ensure your hands stay toasty and your fingers free. Use the subtle front pockets to house your small essentials on your next long-distance run.