These days we have even in Central Europe really hot days around 35C.
I make for my daughter Horse for riding and jumping in the water , to keep her vet and cooled for longer time.
I use a colored bar 160cm x 7.5cm and one interconnect plus about 1m of synthetic three-paired classical rope 18mm.
I use sharp scissors and I glue everything together with thermal glue.
My daughter has 16kg and he can ride this horse in deeper water under my supervision.