Over the years of using a wide variety of Kevlar-belted tyres I have come to the view they are mere placebo designed to part you with your money while offering no real puncture protection in return. I have been using Slime liners with great success; they don't weigh much, cost less than a spare tube, don't have much noticeable effect on rolling resistance and will prevent almost all punctures. Just make very sure the edges are feathered or they will themselves cause punctures.