From left to right: Peregrine 7, Peregrine ISO, Peregrine 10. First of all, these shoes are all very good and they all have flaws. Drop." The 4mm heel to forefoot drop is an amazing design element that promotes a healthier and more secure landing and foot shape. All three have *amazing* eyelet/cleat patterns. All 3 (I think) different materials. They are all very similar and effective although I would say I like the 10s the best. They are a little softer which didn't really impress me but they are very grippy and have survived some pretty tough hikes/routes of over 400 miles on my 10s and the lugs are still noticeable and effective I keep them on the trails no pavement all three models suck on tarmac they just aren't made for that I mean they're running shoes so it feels like a period shoe, but the lugs are designed for unpaved terrain, as is the support for the soul and upper.If you're not on the trail 90% or more of the time, don't buy them. The Peregrine 10 are amazing and I strongly recommend them. I just bought a second pair as my first ones are running out. The top is fantastic. Has a good toe box, really supportive, good lacing system and the heel/ankle area is perfect - low enough that there is no irritation anywhere and high enough to minimize dirt entry and also allows for a lacing/lacing system and upper Design to keep your foot in place and your shoes not moving. I love it. When properly laced and tied, you literally can't take your 10s off without untying them. They are NOT shockproof. Moisture penetrates easily, and when it's cold your feet stay cold until you actually move (my biggest gripe). The Peregrine 7 has the best upper I've ever seen on a shoe. Like the most practical design - particularly resistant to external influences (waterproof, warm, dries quickly and thoroughly) and durable. Also the insole and cushioning in the 10s are very good. Not super hard or soft, good comfortable sweet spot cushioning. I think it could have been a little softer but I haven't had any issues and the stone protection is excellent, the best of all three generations. I stepped on a lot of rocks and was fully protected (I'm 5ft 11" and 190lbs). My toughest days consist of about 4 miles of hard climbing, including sprints, followed by another 5 miles of hiking. Peregrine 10 has always been very comfortable for me. Peregrine 7 is the *ideal* amount of padding. About to the line where it would be too soft, but no higher - it's really amazing. Peregrine ISOs are like walking in wooden sandals. Not good. ISO sucks to be honest. I'm glad they left. They compare to other brands in the mix and they have these amazing cleats but they aren't good peregrine falcons. The Peregrine 7 is IMO the best trail shoe ever (I've had New Balance, ASICS, Alta, Adidas and three generations of Peregrine). Just looking at them makes it clear that they will help you get through a lot. I rode 7s for 30 miles on a long trail in Vermont and they were breathtaking. I hope the Peregrine 11 is somewhere between 7 and 10. 10s design for athletic performance and rock protection, with 7s.Def materials and outdoor approach, worth buying!