Blueseventy Thermal Helix wetsuit long-term review

Over the last few chilly months 220 editor Helen Webster has been testing the Blueseventy Thermal Helix wetsuit, which she describes as a genuine game-changing product

Our rating 
4.5 out of 5 star rating 4.5

We test a huge amount of kit here at 220, but every so often, something comes along that makes a genuine difference to our training or racing. Over the last few chilly months, for me it’s been the thermal version of Blueseventy’s popular Helix suit.


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I’m never happier than when I’m swimming in open water, but thanks to poor circulation and a wimpish disposition I struggle badly with the cold. Adding neoprene gloves and booties helps a bit, but this wetsuit has been a godsend and has meant I could swim in colder waters – and for longer – than in previous years.

The zirconium lining adds snuggly warmth and stops so much cold water getting into the suit, but not at the expense of flexibility, which is still superb. My thermal Helix has accompanied me throughout a series of chilly adventures including training for ÖtillÖ in chilly 10ºC German lakes, as well as some fun off-season events at my local open-water venue, Vobster Quay, all the way into winter. The bonfire night swim was a memorable one, swimming in the dark with a firework display afterwards!

The wetsuit has performed well and is showing no signs of wear and for just £50 more than the ‘normal’ Helix, isn’t unreasonably priced for the amount of extra swim time it bought me.

Verdict: A genuine must-have for chilly swims and colder tri training 95%


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