The Salomon F4.0 is a relatively new aggressive boot made for those that like support and higher end tech. If you are willing to pay the price for leading tech and originality, then this is a good choice. Not much has changed from 2013-2015.
Flex: It’s not super rigid but it’s more on the stiffer side of the spectrum.
Comfort: This and the F3.0 and the F4.0 are the most comfortable Salomon boots I have tried and right there with some of the most comfortable boots out there. Every foot is different but right out of the Box the 3.0 is ready to ride all day. It’s just a shade more on the narrow side and a little shorter compared to Burton Boots and standard Salomon Boots but its a really good fit that feels like it was made around your foot.
Heel Hold: Pretty good heel hold here and I had no issues here. It’s not a super tight grip like BOA but it’s pretty close.
Adjustability: This new lacing system is unique. It’s a little awkward at first but it’s fast once you get use to it. It’s got 2 points where you can lock it. One lock at the ankle and then one lock for the top which gives you separation with one rope. It’s much faster than the Salomon’s Powerlock lacing system which is pretty much thin traditional lace with a handle. You get a little more customized adjustability with the Powerlock but this Wraplock tech is a nice compromise between the two in terms of adjustability and speed. I also like how the entire boot has a lace tightening system compared to Velcro at the bottom zone for the F 3.0. It’s a little better but it’s not a game changer.
Flex Retention: There isn’t much articulation going on but they are made with good long lasting materials.
Response: This is pretty responsive and it’s able to power just about any aggressive board really well.
Traction: Very solid traction and it seems like it can handle deep snow as well as the ice I walked over.
Shock Absorption: The sole cushioning is not like the F22 and F20 where it’s really low profile and lacking a lot of shock absorption. This is damp like the others, but has excellent shock absorption as well.
Footprint: The reduced footprint is right there with Ride and Burton. It’s a great option for riders who are in between sizes. For example if you are a size 10 getting a boot like this will really help you fit into Medium bindings and most boards in the low to mid 25cm waist range
On & Off Ease: Pretty easy on and off and it’s about the same as other speed lace boots I tried.