Reflective yarn for visibility, merino wool or fleece-lined for snugness or even 2mm of neoprene for added insulation: Omie Dale reviews the best warm hats for cold water swimmers.

Presca Cold Weather Hat | £32.50

They say: Handmade in our hometown of Bristol by designer and maker Francesca of The Dotty Fox. Working closely together to craft the perfect cold weather hat, using award-winning yarn spun from post-consumer plastic bottles and finished perfectly by our recycled Presca label.