I sent a nasty gram to Rocky yesterday and had a response to call their customer service, toll free number. I spoke to a real nice lady and explained the problem. She said "we did have a problem with earlier models. Early models, three years ago??? If they were not in an area where they could get ample ventilation, the rubber would dry out and crack." I then asked why they continued to sell a product that was defective? No answer from the rep. What that tells me is they don't care. Rocky has your money and you have some scrap rubber.