The use of widened Velcros to fix the two pieces makes it easier to adjust the height, and the leg pillow does not slide during use. And the edge guards on both sides are made higher and wider to prevent the leg from slipping off.
KingPavonini Adjustable Leg Elevation Pillows for After Surgery Single Leg
KingPavonini Adjustable Leg Elevation Pillows for After Single Leg, Grey
KingPavonini Adjustable Leg Elevation Pillows for After Surgery Double
KingPavonini 4 Height-Adjustable Leg Elevation Pillows for Single Leg, Grey