People often get Columbia's Omni Heat and Omni Tech technologies confused.  Columbia's Omni Heat is a series of thermal reflective dots attached to the inside of clothing and outerwear to help reflect back the heat to you to keep you warmer. Columbia's Omni Tech is a waterproof coating that Columbia applies to it's higher end outerwear.  Columbia's Omni Tech waterproofing has a lifetime warranty, so if you ever have problems with it, make sure to send the article into the manufacturer for repairs. Many pieces of Omni Heat outerwear (think jacket shells) are waterproof because they are treated with Columbia's Omni Tech waterproofing treatment as well.