All-day comfort to keep your focus where it should be...with a gusseted no-bunch crotch and low-profile elastic waistband, the CORE Lightweight Bottom provides just the right amount of warmth for when the temperature dips and dials up the animal activity. Permanent Polygiene® Odor Control Technology neutralizes odor by stopping the growth of odor-causing bacteria and fungi. The CORE Lightweight Series is the next-to-skin foundation for your high-exertion system, breathing efficiently and actively moving moisture away from the skin with its polyester bi-component construction.