These are very cool (literally!) pot holders. They feature unique heat barrier technology and functional air pocket design for maximum heat insulation and grip. In fact they're safe to 675 degrees F, which is very, very good. The specially formulated silicone combined with the "sphere" design gives a cloth like feel and comfort that also gives a secure grip.. Not just extremely functional as a pot holder, they're also great as a trivet or a jar opener. Clean up is simple; just throw them in the dishwasher.