Come and see our amazing products. The more you sweat, the more you lose. You burn anywhere between 300-500 calories in a 20 to 30 minute in this sauna waist trainer and this equals 5 pounds.This training vest can be worn under or over your regular shirts, can't see it under your shirts when you work out please select the black one. Pls confirm with us about the packing info, stock color and exact production time before placing your order.