We've never seen caps made from linen before, and apparently chambray is a fabric that is comparable to denim, so that's definitely interesting!

Description by Lumiere:

The Spot Cap is constructed from a lightweight chambray and linen fabric, these unique fabrics have been hand chosen for their breathability and durability. The cap features a timeless design with our Lumiere woven label and is designed to be worn under the helmet or off the bike. One size fits most.