Tri Training Harder are a group of highly skilled and passionate coaches who help prepare athletes to achieve their extraordinary dreams. Tri Training Harder help Castle Race Series athletes prepare for our iconic events through different coaching packages which include race specific training plans, pre-event training sessions and a virtual training club.

Yonda puts your performance as their focus. Their wetsuits are built with technical neoprene panels, the right balance of flexibility and buoyancy and will aid your swim style. Their Italian made trisuits that are breathable, lightweight and fast drying – ensuring that you can keep racing towards the finish line. 

Yellow Jersey provide event day insurance to cover your race day with Castle Race Series. Since 2014, Yellow Jersey have been protecting triathletes worldwide for crash damage, theft, emergency medical expenses and much, much more.

Yellow Jersey provide affordable event day insurance designed to cover you for the reimbursement of your event entry fee should something unforeseen prevent you from participating (e.g. a new injury). Better still, it also covers your bike for damage when racing and theft when racked overnight, up to the value of £5000, on the day of the event.

Forgotten to add insurance during your entry? You can also purchase your event day insurance separately after you have booked your race entry.