Molehill Baby/Infant/Toddler Boot (Boys & Girls) - Lightweight for Mild to Cold Weather Booties 100% Nylon Shell. 100% Polyester Lining. 600D Polyester Stress Points. 3M Thinsulate Fill. VERSATILE UNISEX KIDS BOOTIES: Water and wind resistant breathable nylon shelled snow booties for babies, infants, and toddlers. Can be worn for fall / winter / spring. So soft and lightweight, they're perfect for new walkers and babies on strollers. LIGHTWEIGHT KIDS SNOW BOOT: 3M thinsulate fill provides better insulation with less weight to keep your little boy and girl warm without the hassle and extra weight of a heavy boot. A great rugged, stylish yet lightweight boot. GREAT FUNCTIONAL FEATURES: Easy on / off with wide slip on opening, faux fur lining for extra warmth and a pop of color, hook-and-loop closure at calf, adjustable bungee cord at instep for the perfect fit for any child. Pair with our Molehill sock liners, simply search for "molehill liners" SAFETY & PROTECTION: Skid-resistant and rugged gripper outsoles grip well on snow and provide great wet-surface traction INNER SOLE MEASUREMENTS (in inches): Small (infant &lt;1 yr) has a 4.5" sole; Medium (toddler 1-2 yrs) has a 5.25" sole; Large (toddlerPlus 2-3 yrs) has 6" sole. SEE SIZE CHART (last image) for details.