LOVE THESE BOOTS BUT THEY DO NOT BREATHE!!! THEY SWEAT NON STOP FROM THE MINUTE YOU PUT THEM ON AND IT TAKES DAYS FOR THEM TO DRY THE SWEAT WICKING LINER UNLESS YOU PUT THEM ON A DRYER. EVEN THEN THEY HOLD A MOLD SMELL. EXTREMELY COMFORTABLE AND WATERPROOF. THE 6&#34; LACE UP VERSION IS A MORE BREATHABLE BOOT AND IS JUST AS COMFORTABLE.