The Power Suit TM vest, ladies model, is black with blue sides and sleeveless, and dates from the 2000s. It closes with a front zip and is designed to hold weights of up to 20lbs to add resistance in fitness training. It is made of Stomatex(R) a biomimetic material that imitates the process of transpiration used by leaves. Made of a non-porous polyester, the membrane is patterned with dome-shaped chambers, each with a tiny pore in the centre, which flex and stretch with the movement of the body. As a result excess heat and perspiration are pumped out of the small pores and drier cooler air enters at a pace in keeping with the pace of activity, creating a constant micro climate between the fabric and the skin.