The Kustom Kit Warmtex® Long Sleeve Base Layer is engineered for cold-weather athletic performance. The advanced moisture management system actively regulates body temperature by wicking perspiration away whilst retaining essential warmth, allowing you to maintain optimal comfort during winter training and outdoor activities. Designed to be worn directly against the skin, the fabric creates an efficient thermal barrier without bulk, enabling seamless layering under jackets or worn standalone. The self fabric collar provides a refined finish and reduces irritation during extended wear. Flatlock stitched seams eliminate chafing and reduce seam thickness, critical for base layers that sit close to the body during high-intensity movement. The removable adhesive neck label ensures a clean aesthetic and prevents discomfort from traditional printed labels. Whether used for running, cycling, team sports, or outdoor pursuits in cooler conditions, this base layer delivers reliable thermal regulation and moisture control. The technical construction ensures durability through repeated washing whilst maintaining performance characteristics, making it an essential foundation for any cold-weather athletic wardrobe.