I don't write many 5s. The fit is good and comfortable. I used it at 43 Degrees with a thin long sleeve tech shirt underneath. I do sweat a lot but the ventilation is good and although I was not perfectly dry, I was comfortable. I did push hard for about 12 miles. I read reviews and found a negative comment that there was too much ventilation - that is why I picked this one. It is just right for me, above 48 degrees I wear a vest. I think this will work down to 30 degrees or even lower with just one long sleeve under it. For those who complain that it is too warm - it advise against wearing this in 60 degree weather if you are working out - I would say 35 - 48 is perfect and use a vest of warmer than that. I can't vouch for durability, I have not washed yet, but it looks very high quality, zippers included and I will probably buy more as gifts.
Rating: [5 of 5 Stars!]