Gul rash vest £12.50 In-store @ Sports Direct, or +£4.99 delivery if ordering on-line

£12.50 if you buy in-store. This is black long sleeved, they also have short sleeved ones.
'This Gul Rash Vest is crafted with long sleeves and a high neckline for a classic look. It features flat lock seams to prevent chafing and are a lightweight construction. This vest is a solid colouring throughout designed with a signature logo and is complete with Gul branding.'

Best to go into the shop and try it on, they are supposed to be a tight fit. I bought a medium, but decided to go back and exchange for a large as it was a bit too tight. Gul are a good and reputable make. If you can't get to a shop, then they do delivery for £4.99