The RefrigiWear ChillBreaker High Bib Overall is a great solution for those that are active but still need warmth. The bib overalls feature a soft, lightweight outershell to give you freedom of movement yet are roomy enough to wear a heavy sweatshirt under the bib. The ChillBreaker High Bib Insulated Overall is comfort rated to 10°F, giving you plenty of warmth, and feature a high front and back design to maximize torso coverage without inhibiting your mobility.Sizing Instructions: For the most accurate fit, take your measurements over the base layer of clothing you intend to wear with this RefrigiWear gear (such as thermal underwear, jeans or a sweatshirt) and refer to the size chart for this product.