The thickest, flat ends of wedge pillows are usually between 6 to 12 inches or 30 to 45-degree angles. Choose a pillow height based on how you plan to use your wedge pillow.
Lower incline (6 inches) wedge pillows are best for using your knees and legs. Use a mid-incline (7 to 9 inches) wedge pillow for back and side sleepers and to improve issues such as sleep apnea and acid reflux. Higher incline (10 inches or higher) wedge pillows work best when used for sitting upright.