from the Club Ride Website: Blue: This category offers a step up in both thickness and density of the padding, catering to intermediate riders or those embarking on longer rides. Level 2 chamois provide better shock absorption and comfort, suitable for varied terrain encountered in mountain biking. These are designed for moderate endurance rides, generally comfortable for durations between 2 to 5 hours. The materials used often have higher breathability and moisture-wicking properties to handle increased sweat and heat. Brown/Green: The highest level, designed for long-distance riders and those seeking maximum comfort and protection. Level 3 chamois pads are the thickest and most dense, providing the best shock absorption and pressure distribution. They are engineered for extended rides over challenging terrain, suitable for over 5 hours in the saddle. Advanced materials and technologies are used for optimal moisture management, breathability, and anti-bacterial properties. The blue ones (gunslinger) have been worn on a handful of rides. They are basically new. The Brown/green ones (woodchuck) have never been worn. Both pairs are *CLEAN* , they are just taking up space in my kit drawer.