When bathing on a stony beach why do the stones hurt your feet less when you get in deep water?

When you wade into deep water, the buoyancy of the water helps support your body weight, reducing the pressure on your feet. Additionally, the water provides a cushioning effect, making the impact of the stones less noticeable. The cold temperature of the water can also numb your feet, further diminishing the sensation of pain from the stones. Overall, the combination of buoyancy, cushioning, and temperature contributes to a more comfortable experience.