The purpose, model and riding purpose of bicycles are divided. Used for leisure short distance and several kilometers slow (about ten miles per hour), grocery shopping carts and bicycles. Only used for short-distance traffic, sightseeing and commuting, used for riding in cities or roads, there are only two requirements for cushions: one is not hard, and the other is environmentally friendly materials that do not hurt the skin (some cheap cushions, newly bought ones also emit a pungent smell of chemical materials, which is harmful to human skin). . . For people who are engaged in fitness, exercise and amateur cycling, as well as bicycles with speed change kits designed for sports, including road bikes, hybrid sports bikes and mountain bikes, attention should be paid to cushions. Not only should there be an ergonomic design (at least, there should be an opening in the middle), but also the length and width of the pelvis should be different according to the structure of men and women, and the internal filler is also very large. Some are hard with soft, and some are soft with hard to adapt to different models and different riders. Road bike is a set of systematic bicycles integrating human medicine, sports science and industrial science, so the requirements for cushion are very high. For example, if you buy a road car, you need to try it on, and the time varies from static fitting for several hours to dynamic fitting for several months, including the size selection of the cushion (see the figure below). The hardness standard of road car cushions is generally 1 or 2. For those who are used to buying grain wagons, riding a few kilometers on their buttocks can't stand it, but for those who are used to road bikes, this kind of hard mat is very conducive to pedaling and exerting strength, and the price ranges from several hundred to several thousand (the drivers who participated in the three international competitions used thousands of high-tech cushions, some were ultra-light and some were 65433). Mountain bikes also have different cushions, such as road-pressing cross-country, forest road cross-country and downhill cross-country. In addition, there are common cushions for road bikes and mountain bikes. . . For people who often ride road bikes or mountain bikes for exercise/fitness, or participate in competitions, they should not only choose a seat cushion that adapts to their hip size and riding style, but also wear riding pants (or underwear) with special pads, so that even if they ride for more than ten kilometers at a speed of more than 20 miles per hour every day for decades, they will not suffer from sports diseases such as prostatitis because of choosing the wrong seat cushion. This is the core meaning about the importance of bicycle cushions, but what about those who ride a grocery cart for a short time and enjoy their bicycles? Meaningless.