Only tried on indoors. The lining is quilted, so I think it will be warm. The forehead piece is sewn in, but the side flaps can be fastened up and down with buttons. The chin snap cannot be adjusted. Head circumference: Approx. 60cm From the top of the head to the tip of the ear flaps: Approx. 34cm Immediate purchase is welcome! If you wish to combine items, please use the bundling feature or leave a comment. Please refrain from price negotiations. Please refrain from purchasing if you are a perfectionist and are concerned about minor details. Shipping via Yu-Yu Mercari Mail, Yu-Packet Plus. Basically, items will be shipped the same day or the next day. Pet owner, non-smoker. Please refer to my profile for details. Flight cap Pilot cap Aviator hat Stains, tears, odors, etc.: None