Look for a wave with a thick, pitching lip throwing out over a deep, trough-like face. The key is a clean, hollow section where the lip connects with the water ahead of the curl. You’ll see a “cylinder” or tunnel shape forming. Waves that barrel often have a distinctive, darker, and smoother face just before they break. It’s that magical, shadowy room we all dream about. If it looks like you could drive a bus through it, you’re in for a treat!