Rapha Men's Core Gilet (£75)
If your dad is into his bikes, then he'll likely already know about Rapha, as it's the GOAT of cycling fashion and a huge upgrade from the current age-old lycra he probably wears. It comes in navy, black, khaki, and tan and can be layered over long-sleeve tops for winter. With reflective details for added visibility, a two-way zip for easy access, and made from lightweight polyester, it's a no-brainer for any cycling fan.