Fieldsheer Men's Premium 3.0 Merino Heated Socks - Everyday comfort with just the right amount of warmth. The Premium 3.0 Heated Socks feature a soft merino wool blend, calf-length design, and a single heat zone under the toes for subtle, targeted warmth. With a comfort toe seam, heavy cushioning in key areas, reinforced heel and toe, and no-slip features, they're perfect for staying warm on chilly days without the bulk. Ideal for daily wear, light outdoor use, or cold-weather commuting. Calf Length; Heat under toes; Heal and toe reinforcement; Heavy cushioning in key areas; No slip features; Merino Wool Blend Socks; L/R Design; Comfort toe; Arch Support; Battery Storage Pocket; LED battery life indicator; Heat Settings: 4 Adjustable Heat Settings (90deg up to 135deg); Up to 9+ Hours of Power Per Charge - (3.5+ High, 4+ MedHigh, 6+ MedLow, 9+ Low); Micro USB Charging Input; Dimensions: 3.1in x 1.8in x .5in; Charge Time 4-5 Hours; USB to Micro USB Charging Cable Included; 2) Powersheer Micro Rechargeable Lithium-Ion Battery (3.7V 2200mAH) - Model MWCB37V2221; Style: MWMS2122;