It looks lightweight because it is. But the protection from the elements is heavy duty.

Product Features
•100% Waterproof
•200g insulation
•BioGrip slip-resistant outsole
•Bogs Max-Wick evaporates sweat to keep feet dry
•Circumference = 10 inches
•Comfort rated to -22F/-30C
•DuraFresh natural bio-technology activates to fight odors
•Elastic-lace system provides a comfortable, secure fit
•Height = 10 inches
•Rebound cushioning provides all-day comfort and energy return