The 507s ergonomic fit is a melding of the classic 504 cap & the fit of a baseball Made using a seamless knitted blocked wool fabric The Seamless Wool 507 presents the original 507 cap without the seamed side panels Shape- Ivy Caps & Flat Caps Fabrication- Wool Felt Material- 70% Wool / 30% Modacrylic Brim- 1 3/4 inch peak Lining- Unlined Crown- Blocked Season- Autumn/Winter