Help ! Are these rare vans ??

So I have a pair of these in my closet barely worn and was searching online what they were so I could sell them second hand. I can only find 2 places online that sell these and they are 2 thousand pounds plus !! Does anyone know why ? And how much I could sell mine for ?

So I have a pair of these in my closet barely worn and was searching online what they were so I could sell them second hand. I can only find 2 places online that sell these and they are 2 thousand pounds plus !! Does anyone know why ? And how much I could sell mine for ?