Crocs get cosy! Based on the best selling Crocs Mammoth design, the Crocs Blitzen has all the Crocs comfort & warmth you could possibly want, & the Blitzen has the added benefit of closed side vents, so it's better suited to the bad weather, & we do tend to get quite a lot of that here, don't we! Made from Crocs croslite material, the Blitzen will be super comfy, & the shoe will conform to the shape of your foot, giving you a level of comfort not to be missed! the Blitzen had non-slip soles & is lightweight, it's also machine washable (max temp 30) so go crazy & get out there in the mud! Size Hints As there is a liner in these shoes, some customers have chosen to go up a size, we recommend if you are a half size to go up, so e.g if you are a 4.5, go for the 5, but please be aware that the liner will flatten a little after wear, making the shoes a little more roomy, so don't worry if they feel a little snug at first try, Please do make sure you are happy though before you wear them, worn shoes cannot be returned!