I received the official Samsung Galaxy Watch Ultra PeakForm Band today, I used a discount code on the Samsung shop app and got it half price for £33 roughly.
It's my favourite band by far, it's like a tightly woven nylon fabric on the outside and inside the band is like a rubber/Silicone with a ribbed finish which is very comfy, no sweating or irritating my skin.
I have an 8 inch wrist to give you context to fit, i chose the Orange but it comes in dark grey and white sand. I went with the Orange to match my watch. I also have the official trail band and the marine band. Let me know if anyone is interested in a comparison video of the 3 different bands.
Out of the 3 this is my favourite currently but I have to use the Marine band a little more to be certain.
Let me know your thoughts and any questions please ask.