The heated Pant Liner is designed to be worn under outer garments. They are styled with formfitting patterns and sizing to fit snugly and easily under your outer garments but denim is not recommended. The Pant Liner provides an even distribution of warmth throughout the hips and the top of the legs. Each pant leg includes a full length zipper from the hip to the bottom of the leg. Every article of Gerbing's heated clothing comes with a fused battery harness that connects to the battery and plugs into the jacket, gloves, etc. No additional wiring in needed for this to work although we should point out that while connected to the battery the garment will be on full. The purchase of either a Gerbing's on off switch or a Gerbing's temperature controller will make this garment much more comfortable.