Climbing
If you have a climb speed, you can use move actions to climb slopes, walls, and other steep inclines, and you don’t need to attempt an Athletics check to climb except in hazardous circumstances (see the Athletics skill starting on page 136). You are not flat-footed (see page 276) while climbing. You receive a +8 bonus to all Athletics checks to climb and can always take 10 while climbing, even if distracted or threatened. You can move your full climb speed when you use the move action while climbing, but you cannot run. You can move double your climb speed with a successful Athletics check to climb, but you take a –5 penalty to the check. Creatures without a climb speed use the Athletics skill to climb.
Source
Core Rulebook pg. 259