Training apparel come in variety of styles and material that use HRT(Heat-Removal Technology). It is a combination of two polyester micro-fibers along with that very important cooling layer on the inside. Our PowerFlex and PowerFlex-MAX are made from a Lycra and polyester blend. Lycra is an elastomeric fiber which is a natural or synthetic polymer that, at room temperature,can be stretched and expanded to twice its original length. Our VaporICE-Max material is our higest grade of HRT material because of it is extremely lightweight and dries extremely fast thus keeping your body dry and comfortable for a long period of time.