Boreal Hand Warmers Metro HTHR - XL. After the ski gloves come off and your ready to hit the town, the super-soft Boreal Hand Warmers are the perfect place to keep your chilly hands. Made with a warm and comfortable merino-wool blend, the Boreals feature a fine-gauge knit with an oversized ramâs horn cable detailing. The fingerless silhouette features an extra-long ribbed cuff for added warmth, and can also be worn cuffed when wearing long sleeves or a jacket.