There are several types of awnings capable of effectively protecting your patio: 1. Standard awnings. The articulated arms and fabric remain exposed when the awning is closed. 2. Cassette awnings. The articulated arms and fabric are protected from UV and moisture within a sealed cassette. 3. Semi-cassette awnings. Only the fabric is protected within the sealed cassette. 4. Awnings with a roll-up valance. Extra fabric is integrated into the outside bar holding the fabric. It provides protection when the sun is low in the sky.