Don't know if this is the right section, but here goes.
I have two, red slidesheets, each measuring 68inches in total circumference and 14inches wide. Red, nylon material. Manufactured by Polymorit.
They used to be one whole sheet, but I cut it in half, as it was too wide.
It is, of course, joined and double sewn in the middle.

We never used these sheets, just bought for spare ones, so they are brand new, just been kept in a plastic bag.
If anyone would like them F.O.C., then please Private Message me and I'll post them to you.