1.5mm Thick PVC Chair Mat for Carpet Floor, Eco Floor Protector for High Pile Carpets Non-Slip Wear-Resistant Transparent Chair Cushion

Does exactly what it says on the tin 👍

Not suitable for it's purpose. Might be OK for generally protecting a carpet but useless for underneath an office chair (i.e. with castors) Didn't help that this product arrived folded up so when placed on the carpet it was like moving your chair over speed humps. Folds aren't likely to disappear.

Rolls itself up any time you move your chair

It works well