The EXT Stealth has a center cutout. The cutout is for those cyclists who want extra perineal relief, but still want the ability to ride on the nose. The nose width ranges from 45mm to 70mm. The rear width ranges from 120mm to 165mm. (Width may be limited when the front or rear are adjusted to a wide position.) Helps relieve genital numbness, saddle sores, and sit bone pressure.