For bedding in my trolleys I use the
Snooza pet futons - Australian made, using an Australian wool blend, quilted and encased in a calico cover. Warm in winter, cool in summer!
They're machine washable. Most pet shops sell them. I have a
couple of terry towelling and satin covers that I pop them in for shows.
I also use the satin beds, particularly to reduce static in
the coat, so it depends a lot on the weather as to when I use
them. The white satin futon pictured bottom left is made by
Kool K9's in WA.
Cooling mats are popular in the harsh Australian climate. Some of these mats stay cool for 10 days!
Another item I use for young pups at their first few shows is
Dry Bed which allows the dog to stay dry on top as bed traps moisture below the fibres to the bottom of the bed.