Regatta Men's Highton II Zip Off Trekking Trousers - 44 - Black - Available at M&S

Whatever the weather, dress for your next hike in these trekking trousers from Regatta. They're made in a regular fit from the brand's flexible ISOFLEX Active stretch fabric, which has a durable water-repellent finish. A zip-off function at the knee turns them quickly into shorts when the temperature changes. They have multiple pockets to store your essentials.