/ Sleep mats
Could you not just add a bit of closed cell foam to the bottom of a normal length mat? Considering it's only for warmth rather than comfort.
'Foam Centre' just off SW corner of St Enoch Sq.
(that's a guess btw)
then try googling Beacons Products.
They make Multimat foam mats, but also make bespoke foam products.
Or buy this, and have several layers each on top of the other.
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