This is Shimano's third generation winter boot and it's easily the best yet. For a start, their new shorter, broader fit gives easy toe wiggling for restoring circulation and there's a full Gore Tex liner in the 'shoe' part to keep you dry.
Insulation levels are somewhere between the skimpy Northwave and super cosy Lake, but we never suffered cold feet despite some long sub-zero rides. The neoprene collar makes all the difference by creating a great thermal seal without any movement restriction and any water that does seep through is at least warmed up when it gets there. It is an absolute swine to get your foot in and out of though, and the older boots used to tear here, which is a slight worry - although nothing bad has happened to ours yet.
Tread overlap gives some bump protection and broad twin straps secure the shoe without pressure points. You'll need to clean the Velcro out regularly to keep it 'sticky', though. The lack of toe studs is a disappointment for proper mud grip but what tread there is bites pretty well. The sole is flexible enough in the toe for short walks, yet there's no loss of power when you're stamping on the pedals. Price and weight are also excellent for the performance you're getting.
