Gorwydd Mature Caerphilly is a traditional Welsh cheese produced by Trethowan Brothers. It is renowned for its deep, complex flavor profile, distinguishing it from other Caerphilly cheeses. Typically, it features a moist, slightly crumbly texture with a fresh, lactic tang and earthy undertones.

As it matures, Gorwydd Caerphilly develops a distinctive rind and a creamy layer beneath, which contrasts beautifully with its firmer core. The production process follows time-honored methods, using raw cow's milk and a natural aging process, which can take several months depending on the desired maturity.