I have been using these pillows for about 5 years. The first time I tried one it provided me with the best nights sleep ever. The way it gently cradles the head and neck for a side sleeper like me is fantastic! The first 2 I purchased were full size and worked great with queen or king bed linens. Recently I purchase two medium or midsize units. I like these for travel as hotel pillows are terrible. Buy a Tri-Core Cervical Pillow and have a good nights sleep. Tell them Charlie told you about!