Finding waterproof winter boots that are non-leather can be difficult. Here are some suggestions:
For Women:
From Moo Shoes
Wide variety can be found here: http://www.mooshoes.com/women-s-shoes/boots.html#/page/1
From Pangea
http://www.veganstore.com/product/janet-boot/womens-vegan-shoes
http://www.veganstore.com/product/1193/womens-vegan-shoes
From LL Bean
http://www.llbean.com/llb/shop/61955?feat=Winter%20Boots-SR0&page=women-s-snowfield-boots
From REI
http://www.rei.com/product/874730/kamik-baltimore-winter-boots-womens#tab-description
From Totes
Several of their winter boots sold in stores appear to be all synthetic. Read labels.
For Men:
From Moo Shoes
Wide variety can be found here: http://www.mooshoes.com/men-s-shoes/boots.html
From Blair
Totes insulated boots: http://www.blair.com
From Bogs
Many of their winter boots are non-leather: http://www.bogsfootwear.com
For Kids:
From REI
http://www.rei.com/product/857890/kamik-grandslam-winter-boots-kids
From Chooze
http://www.choozeshoes.com
From LL Bean
Kids’ and Toddler’s Snow Tread boots found here: http://www.llbean.com
From Bogs
Many of their winter boots are non-leather: http://www.bogsfootwear.com