Just purchased a new ColaReb Sienna strap for my Oris Big Crown ProPilot. Purchased from Holbens, through Amazon. I had purchased the watch on its gray textile strap, which I really like. Just wanted to try something different. The strap seem very well made and is very smooth. They have several straps in their vintage line with a rougher look. But I wanted to try something smoother first. For a leather strap it has a slight feel of rubber, perhaps because it is so smooth. I think it pairs nicely with the watch. It probably needs to be worn a bit to break in but I cant imagine that will take long as it is flexible. I have had it on for a couple of hours and it already feels much nicer than when I first put it on. Now this is only the third strap company I have used for any of my watches, outside of OEM straps, so I do not have much experience. The first was a Hirsch Robby for a Muhle Glashutte 29er big. That's a great sports strap. I would say the quality of the ColaReb and the Hirsch to be about equal. The second was Vintager Straps by Micah. I had purchased a black leather for a Breitling Avenger II Seawolf and a black shark skin for a Panerai 1312. Both of those straps are in a different league altogether, albeit, with a much higher price. Even though the Panerai is just made for switching straps I may never take that shark skin off of it, its so nice. However, I am happy with my purchase and would happily recommend a ColaReb Straps to anyone. I will probably purchase a brown and a gray strap, from their vintage line, for this watch. For those wondering about measurements, my wrist is slightly over 7" , strap length is 120/80 mm. I am wearing on the second hole. I found it a little tight at first, but the third hole was too loose. After wearing it for a bit it feels just fine.