Having to replace my 5 mm mat, I was on the fence between the 4 mm and 6 mm mat, with the main factors being- cushion, stability and portability. I ultimately chose the 4 mm Everyday mat and I'm really happy with it! Despite the decrease in thickness, it provides good support on the joints and a better sensation of being grounded. As for the colour, the Jasper Green is gorgeous! Without seeing it in person, I couldn't tell how vibrant or muted it would be. It is more on the deeper muted side (almost black in dim light), which is what I wanted. In the daylight, it appears brighter, as in the photo. I'm only on day 2 of using it, so it is still stickier than I prefer. Hoping it will smooth out slightly over time, but otherwise, the grip is amazing!