Good. but it should not be a separate option. - Helinox Ground Sheet

This item is just nice and works perfect. I can seat comfortably on any kind of surface, despite my weight is close to upper allowed for the chair. Makes chair much more stable. But let be honest - it is a patch for the chairs which are unstable on uneven soft surfaces. It should come together with chairs. As an option you could make chair cover convertible to such ground sheet so that it stores chair when it is folded and serves as a ground sheet when chair is in use. 5 stars for quality, 2 stars for price and desire to turn the product issue into feature to be sold