Very Thin- water gets inside. [SEP] These are equivalent to plastic bags from a grocery store. Not recommended to trap heat. Very thin. The attached pictures show the difference between the durable ones I've used compared to these.<br /><br />When using in the shower as a conditioner cap, a pool of water got inside. These are useless unless you double or triple layer them.<br /><br />It literally fills with water. This cannot be used in the shower or with any liquid product.