The Silver Linining is a simple invention which works amazingly well. It is a traditionally shaped pillow filled with a quality polyester hollow fil, into which is inserted an air pocket which you can be adjusted by blowing inflation or deflation. A common mistake people make when first using a Silver Lining Pillow is overinflating it, the idea is to just put a little air in it so that when your head/neck rests on the pillow the air is displaced and the pillow airbag combination can gently cradle and support your neck giving the muscles and ligaments the support the crave. We generally find it takes people a week or so of experimentation to find the perfect air pressure for them. The pillows are washable but we reccomend you change your pillow every 12 months which may seem extravagant however for something which is supporting the most vital part of your body for 8 hours a night 365 days a year, maybe under 7p per night is not over the top.