Don't miss the biggest names in sport climbing, traditional climbin and bouldering in the "Dosage Volume 4" DVD. Watch as Lisa Rands completes the first female ascent of England's Peak District, Chris Sharma's first accent of Dreamcatcher and more in this action-packed DVD.

• Sender Films
• Big UP Productions
• Lisa Rands
• Chris Sharma
• Tommy Caldwell
• Dave Graham
• Randy Puro
• Courtney Hemphill