For optimum warmth we recommend upsizing the Shell Mitten one size larger than you measure your hand for. More room in the mitten means greater space for warmth, especially when you are in the field for extended periods of time. It also leaves extra space to add an additional hand warmer in the top of the mitten.
Be sure your fingers are apart when measuring the circumference of your hand.
If you measure on the high side of one size, consider the next size larger if a snug fit
is not what you prefer. If you have any specific questions about fit, please feel free to
call us, and we will assist you in making the choice that is right for you.