1,This item is NOT A HARD CASE. This item is a Special Vinyl skin/decal sticker and is NOT made of rubber,silicone, gel, or plastic.Easy to apply and easy to remove, leaves NO sticky residue behind. 2,The skin also has a waterproof, scratch-resistant, anti-fingerprint, aesthetics and other functions.The skin is very light and thin, it will not increase the laptop weight and thickness.It does not affect the laptop heat loss because,some cover skin is biger. i will Fold the cover skin to Envelope,so it have some Crease . but,please do not worry.if you received the item. please stick cover to your computer,the crease will disapper.