There is no one-size-fits-all aider. What you buy will depend on the type of wall you are doing. Here is a guide to helping you choose the right aider.
Length and Number of Steps
If you are doing a wall with lots of free climbing, you want a shorter aider that will be less bulky when clipped to the side of your harness. If you are doing an aid-intensive route, you want a longer aider that will give you more bounce-testing options.
When considering length, it is much more important to look at the overall length than the number of steps. All manufacturers count steps differently. For example, the Petzl WallStep 7 Step Etrier is the same length as the Metolius 5 Step Aider because Metolius has sub steps that are not counted. More important than the number of steps is where they are located. If possible, you want to try walking up a pair of aiders with you harness and fifi so you can see if the aider steps are where you want them when resting on a piece.
Hopefully one day manufacturers will name their aiders by length rather than by step numbers. That will make it much easier for climbers to compare and contrast them.
Types of Aiders
There are three common types of aiders to consider:
1) It is much less prone to twists and "going inside out" than standard aiders.
2) You don't have to orient the aider step to the correct side when you are stepping into it. This is especially helpful for beginners, which makes this style aider the best for climbers learning to aid climb.
3) Because the steps are closer together at the top, you can often rest two feet in the aider at the same time.
The downside for aid ladders is that they are a little heavier than standard aiders and generally have more material, which means they are more likely to get stuck in the crack — which really sucks when moving from aid to free.
When buying a ladder-style aider, try to get one with a beefy plastic spreader bar at the top. Without a spreader bar the aider will be difficult to walk up once you weight the bottom step. As you can see in the photo below, the upper step on the aider without the spreader bar (left) gets compressed.
Standard Aiders AKA Etriers
Lightweight Aiders AKA Alpine Aiders
The most comfortable aider is going to be the one with the widest webbing in steps with the most reinforcement that does not crush your feet from the side. We find aiders with urethane-like coating on the steps usually the most comfortable because the extra structure digs into the bottom and sides of your foot less.
Ease of use free climbing
Everything that makes an aider comfortable and easy to walk up tends also to make it cumbersome with which to free climb. This is because the features that make an aider comfortable also make it bulky and likely to get stuck in cracks. When doing a lot of free climbing, you want an aider that bunches up small on the sides of your harness.
Features that are Important and Not Important
- It is important in a ladder-style aider to have a spreader bar.
- It is important to have a grab loop up top (pretty much every aider has one).
- It is NOT important for there to be a loop at the bottom of the aider for clipping a weight. Many manufacturers design this for high wind situations. Chris has climbed in a lot of high winds and never felt the urge to use this feature. And even if he did feel the need, it's almost as easy to clip a weight to the bottom of the aider itself.
- It is NOT necessary to have extra elastic to keep your feet in the aiders when cleaning. Yes, at first when cleaning your feet will come out more than you like. But over time you will learn to keep your feet in. Using the elastic takes extra time and makes it harder get your feet out when you want to.