An anatomical support device (5; 105) comprising: a lower portion (10; 110) having a bottom side and a top side (11; 111), the lower portion (10; 110) has a length (L1) measured along the bottom side extending between a front and a rear of the lower portion (10; 110); a contoured upper portion (20; 120) extending from the top side (11; 111) of the lower portion (10; 110), the contoured upper portion (20; 120) is aligned with the length (L1), the contoured upper portion (20; 120) separating a first support region (14; 114) of the top side (11; 111) of the lower portion from a second support region of the top side (11; 111) of the lower portion ; the contoured upper portion (20; 120) having a width (W2) that is generally perpendicular to the length (L1), the length (L1) being greater than any portion of the width (W2), the contoured upper portion (20; 120) having a centerline extending parallel to the length (L1), the contoured upper portion (20; 120) at the centerline being continuously curved along at least 95% of the length (L1), wherein the lower portion (10; 110) and the contoured upper portion (20; 120) are formed from a flexible plastic material and are inflatable and deflatable to adjust the degree of inflation, characterized in that the contoured upper portion (20; 120) tapers in width (W2) when moving from the rear toward the front such that the width (W2) measured perpendicularly to the centerline decreases when moving from the rear toward the front , and wherein a height of the contoured upper portion (20; 120) is measured perpendicularly from the bottom side at the centerline , wherein a centerline maximum height (H1) is located closer to the rear than to the front . a lower portion (10; 110) having a bottom side and a top side (11; 111), the lower portion (10; 110) has a length (L1) measured along the bottom side extending between a front and a rear of the lower portion (10; 110); a contoured upper portion (20; 120) extending from the top side (11; 111) of the lower portion (10; 110), the contoured upper portion (20; 120) is aligned with the length (L1), the contoured upper portion (20; 120) separating a first support region (14; 114) of the top side (11; 111) of the lower portion from a second support region of the top side (11; 111) of the lower portion ; the contoured upper portion (20; 120) having a width (W2) that is generally perpendicular to the length (L1), the length (L1) being greater than any portion of the width (W2), the contoured upper portion (20; 120) having a centerline extending parallel to the length (L1), the contoured upper portion (20; 120) at the centerline being continuously curved along at least 95% of the length (L1), wherein the lower portion (10; 110) and the contoured upper portion (20; 120) are formed from a flexible plastic material and are inflatable and deflatable to adjust the degree of inflation, characterized in that the contoured upper portion (20; 120) tapers in width (W2) when moving from the rear toward the front such that the width (W2) measured perpendicularly to the centerline decreases when moving from the rear toward the front , and wherein a height of the contoured upper portion (20; 120) is measured perpendicularly from the bottom side at the centerline , wherein a centerline maximum height (H1) is located closer to the rear than to the front . <EOS>