Big UP's Dosage series is the definitive annual portrait of climbing's state-of-the-art. Volume IV follows the biggest names in sport climbing, traditional climbing, and bouldering as they make historic ascents at spectacular locations around the world. Highlights include: Tommy Caldwell's marathon El Capitan linkup, freeclimbing both The Nose (5.14a) and Freerider (5.12d) in under 24 hours; Chris Sharma's first ascent of Dreamcatcher (5.14d) in Squamish, BC; Dave Graham's first ascent of Coup De Grace (5.15a) in Ticino, Switzerland. Lisa Rands on first female ascents of scary grit routes in England's Peak District; Sharma and Graham opening a new level of hard bouldering in Hueco Tanks, Texas; And much more.