The CS2 is great for indoor and outdoor practice. The patented integrated rail/tee system has been designed to accommodate all types of putting strokes ( squared to square/arced). The runway component simply clips onto the base plate and the adjustable end gates ensure a square putter face at impact. The unit is completed by the unique CS2 putting cup which assists with learning pace control. All of the above combine in a totally unique way to help you master the 5 Putting Fundamentals. The CS2 Putting Trainer was a Golf Digest Editors Pick Top 10 Product at the 2013 PGA Merchandise Show.