GEL Cushioning System (1986):

The GEL cushioning system was first introduced in ASICS shoes in 1986. The system consists of silicone gel inserts in the midsole of the shoe, which provide shock absorption and cushioning to the foot. The GEL cushioning system is a key feature of many ASICS shoes, providing superior shock absorption and cushioning to the foot. 

The system uses silicone gel inserts in the midsole of the shoe, which compress and absorb impact forces during running or other high-impact activities. This reduces the stress on the foot and lower leg, helping to prevent injury and improve comfort.