Due to a mixup at VetnPet Direct, I was first sent the green gloves, then the 'puncture proof' orange gloves I ordered. At a guess - the reason they colour these differently is because if they were both green you would have no idea which is which. If there is any actual difference in puncture tolerance or thickness between the two, it's literally measured in microns. Really not worth an extra 10 bucks. Neither glove will hold up to picking up live rock, handling urchins, or anything much else for marine aquarium use, though they will prevent coral and anemone nematocysts, bristle/fire worms, and other nasties from firing on contact, which is good enough to be worthwhile. And of course they seem to prevent any skin oils and other contaminants from from getting in the water just fine. I seriously would not count on them standing up to anything with a piercing or biting action though. If you combine these with some cheap washing up gloves (eg latex powder free gloves) for rough/sharp surface handling, and some rubber bands to stop the washing up gloves filling with water, you have something close enough to proper 'reef tank' gloves ($20-30 per pair) a lot cheaper.