Colombia Sportswear Men's Silver Ridge II Convertible Trousers (£53, originally £65)
Outdoor trousers are a must for any hiking dad, especially in the temperamental British weather. If he's planning to go climb Mount Snowdon, then these Columbia trousers will be the practical go-to item he'll need. The two-in-one combo makes them not only ideal for winter, but the detachable legs quickly transform them into shorts for summer, too. Comfortable, water-resistant, and lightweight make them a Christmas gift that works all year round.