i) Laksen Knitted CTX wool hat.

http://www.swillingtonshootingsupplies.co.uk/store/product/8229/Laksen-knitted-Ctx-hat/

ii) Secolux Ventile® All Weather Cap.

http://www.secolux.co.uk/ventile-all-weather-cap.html


iii) Berghaus Goretex XCR Mountain Cap.

http://www.amazon.co.uk/Berghaus-Mens-Mountain-Gore-Tex-Lined/dp/B004BX8W8Y

Depending on the weather and conditions.