I'm at the age when my arms scratch, bleed and bruise very easily, and taking medications doesn't help. But, I still have to get my gardening done, and I have a couple of very exuberant dogs! I decided to try a pair, and I have to admit, I was dubious - not only of buying off the Internet, but of the sleeves themselves. Let me assure you - these things are GOLD! They DO work! No bug bites, not scratches, no bruising, no bleeding from branches...and they ARE cool - not hot - and they stay cool for extended periods of time. Easy to wash, and they stay the same size as purchased. I bought another pair, and will probably buy another!