The new 2.1 612 Version gets an updated Active system which offers more movement, which helps mobilise inverterbral discs with a clear noticeable difference when riding. It's especially good on rough roads and trails as well. The 2.0 also received a slightly updated shape with a more pronounced rear section offering a larger "sweet spot" for all types of riders. The Ergowave 612 is a road specific saddle with a sleek aesthetics with all the function built in to improve short and long road rides. Utilising the S-tube rails adds only 50grams more compared to the carbon alternative. Great performance to price ratio! A new and refined shape developed in collaboration with the University Hospital of Frankfurt and Frankfurt University. A specially designed shape works in unison with the human skeletal system allowing less gooch pressure and higher power outputs. Rather than a cutout running full length of the saddle which creates pressure spots the SQlab supports your sitbones while allowing up to 65% pressure relief. Starting with multiple widths and the raised tail isolates your sit-bones for better ergonomics. A wide, flat and blunt nose still remains comfortable when you are on the rivet. Try it for 60days and if you are not happy with the comfort for any reason, we'll give you a full refund. How do I know what size I need? Before purchasing a SQlab saddle you can order a free home fit kit to determine which saddle size you require. It will take into account your sit bone distance (the part where you contact the saddle) and also your style of riding which determines the degree of hip rotation. How does sizing work? Once you have your sit bones accurately measured you'll need to add 0, 1, 2,3 or 4cms to the sit bones measurement depending on your riding position. A more upright positions will add width. The more dynamic the riding position the more hip rotation and hence the narrower the contacting part of your sit bones and hence a narrower saddle will provide the correct fit. This works the same whether you are male or female Width: 120, 130, 140, 150mm Length: 275mm Weight: 200g (130mm) Rails: S-Tube Road, Gravel and Marathon Unisex