We recommend our Guide Pro EverTherm Mittens on cold days when you're actively trekking up a mountain or shoveling out your car. The merino wool blend lining naturally draws away moisture, while the 340g PrimaLoft® insulation keeps your digits warm.NOTE ON SIZING: These gloves feature a performance fit which is secure on the hands and fingers without restricting mobility. Please refer to the size chart to get the best fit.