It is fabric lined and has a velcro size adjuster

For added shade from the sun the brim can be turned down resulting in a bell shape that will certainly provide added protection

4" brim for optimal shade

The softness of this hat makes it very packable and a great travel companion

Tilley - TM10 Cotton Duck with Mesh Hat Size:8 It is fabric lined andThe TM10 Tilley Hat, designed with a broad brim, has a strong '3 D' polyester UPF 50+ mesh which also blocks sunlight, but allows air to pass easily. The mesh has also been treated to provide water repellancy. The cotton duck brim fabric is derived from an incredibly durable sailcloth that is still used in boating today. Features Guaranteed for life not to wear out Insured against loss Excellent sun protection, rated UPF 50+ Dark underbrim for glare