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How to Choose a Bouldering Crash Pad

Bouldering Pad Hinge Designs 2015: Left stack of pads (taco style); Bl...
Photo: Chris Summit
Tuesday July 16, 2019
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More than a decade after bouldering pads became popular, the bouldering pad industry is still going through big changes. Even big manufacturers are changing their designs every year while small upstarts are introducing new innovative designs and features. There is a lot to cover when looking at a pad.

Taco, Hinge, Hybrid, or Baffled Design?

There are a lot of small differences in bouldering pads and two big ones: the foam they use and how they deal with folding into a backpack. To the folding question, there are a few options: taco, hinge, hybrid or new baffled. The taco style is a continuous piece of foam that folds in two and makes a taco shape. The upside is there no hinge that could fail on uneven terrain. The downside is that it does not fold flat to lay on ground or store well.

The Black Diamond Drop Zone's taco closure style makes the pad...
The Black Diamond Drop Zone's taco closure style makes the pad awkward to carry but eliminates the unwanted 'dead zone' found in hinged pads.
Photo: Henry Feder

The hinge style has a crease in the middle of the pad created by cutting the foam into two sections. The upside is that it does fold flat to lay on the ground or to store it. The downside is that the hinge could fail on uneven terrain.

The main flaws with the Taco folding designed pads are that they are more cumbersome when folded up. A hinged pad that folds flat and square, whereas a taco style closure pad does not open up and lay perfectly flat, it usually has a slight bend or curve to it. The other minor flaw with the taco design is that over time they usually get an annoying lump in the center where it is folded. Storing your pad in the open position can lengthen the crashpads life.

This photo demonstrates how rocks can poke through a hinge-designed...
This photo demonstrates how rocks can poke through a hinge-designed pad. This shows a Metolius with an "angled hinge" that does a lot better job at keeping objects from protruding through the hinge from underneath than the basic non angled hinge style.
Photo: Chris McNamara

The taco type designs hold the pad (in pack mode) with a slight tilt or twist. It is not really a big problem, but it feels a little awkward sometimes, especially if the pad is heavily loaded. The hinged pads make a nice flat backside in backpack mode and carry the loads well, albeit a usually smaller amount of stuff then the easily loadable tacos.

On perfectly flat and even surfaces, the hinge styles are a little better because they lay flat and are less likely to get picked up by the wind. On uneven rock surfaces there is a flaw with hinged pads: if the hinge lines up with a sharp or pointy rock it often does not cover it with padding and worse yet it also hides it. If you fall onto that point, there will be little to no padding: a dangerous surprise!

A long Velcro flap closes the hinge of the Duo.
A long Velcro flap closes the hinge of the Duo.
Photo: Jenna Ammerman

There have been attempts to solve this issue with hinged designs. The first was to introduce an "angled hinge" like on the old Metolius Stomp and currently on the Metolius Session II. This angled design helps a lot because it's less likely a rock or root or another object could protrude through the hinge.

The Session II's angled hinge worked well on even landings, but...
The Session II's angled hinge worked well on even landings, but without a velcro flap running down the length of it some parts felt very soft.
Photo: Jenna Ammerman

Another design is the "hybrid hinge" design where the top layer is a continuous piece of foam, but the bottom layer is hinged. An example of this is the Organic Simple. A hybrid hinge means that even if a rock gets through the bottom layer, you still have that top layer. It's a better design than the original hinge. Our testers tend to prefer the hybrid hinge design over all of the other options for crash pad design.

The hybrid hinge design on the Simple creates a no-dead-spot landing.
The hybrid hinge design on the Simple creates a no-dead-spot landing.
Photo: Henry Feder

The fourth and final style of pad we tested is the new baffled design on the Mad Rock R3. There are 7 separate baffles, or long tubes, filled with foam. In the case of the R3 (Reduce Reuse Recycle), it is shredded recycled foam. The baffles are separated by 6 partial hinges that are about half the thickness of the pad and do not have the problem of hinge failure like fully hinged pads have when a rock can protrude through the hinge. The baffles combined with the soft, shredded foam allow the pad to conform to lumpy, uneven terrain like no other pad we tested. The pad is shaped like a taco style for the most part, but it is so squishy that it can easily flatten into a car or storage area like a hinged style pad, so it has the best of both worlds.

So should you get a taco, hinge or baffled style? It all comes down to personal preference. Many boulders swear by one design and curse the other. We can see the pros and cons of each, so we will let you decide.

Comparing the different hinge designs compared to the taco style at...
Comparing the different hinge designs compared to the taco style at the bottom of the image.
Photo: Chris McNamara

Foam Stiffness and Composition

On the surface, it may appear all pads use similar foam. They don't. Each manufacturer uses different foam based on three factors:
  • Foam type: open cell, closed cell, or memory foam.
  • Foam composition: how many layers they use of each of the three foam types.
  • Combined foam thickness: anywhere from 3.5-5" for medium pads and 4-5" for big pads.

A pad is stiffer, softer, durable, or not durable based on how the three factors above are combined. In general, stiffer and thicker foam will last longer and be better for really big falls because you are less likely to travel all the way through the foam and "bottom out." That said, stiff foam can be unforgiving on short falls. If you have to clench every muscle in your body and let out a Judo style yell from only a 2 or 3 foot fall onto your back, then the pad is maybe too stiff. We generally preferred stiffer foam because it works for both high and low falls and will last longer over time. Also, usually someone has an old beat up soft pad that can be used on sit starts where you might take a 1-2 foot fall onto your back and want soft foam.

The Black Diamond Drop Zone on top and the Black Diamond Mondo...
The Black Diamond Drop Zone on top and the Black Diamond Mondo underneath. Here you can see the closed cell foam on top (black) and the open cell foam underneath (white).
Photo: Henry Feder

Pad Size

There are two main pad sizes: medium pads are about 3 x 4 feet and large pads are about 4 x 5 feet or 4 x 6 feet. There are also much smaller pads, but we don't typically recommend these unless you can afford a giant quiver of pads or travel on planes a lot.

Choosing pad size is easy if you have a big truck or van and lots of money: get all sizes of pads, pull up to the boulders, and assess your needs. For the rest of us, there are big trade-offs: bigger pads are much harder to transport in a small car, are more expensive, heavier, and harder to hike with through tight trails and boulders. Smaller pads are easier to travel with but offer a smaller landing area. Sure you can stack smaller pads, but it means managing many more seams where the pads meet. In general, when you start out, it is good to get a smaller pad because it will be so versatile. Once you are bouldering more often, you will want a big pad (and wonder how you ever bouldered with just one small pad). Some pads like the Mad Rock Duo have ways to link together multiple pads when walking to the crag. This is something to consider as down the road it is nice to have the versatility of being able to carry multiple pads.

Packability — How the pad stores gear

For storing gear with the pad in backpack mode, four factors come into play: flaps, straps, taco vs. hinge, and pad stiffness. Closing flaps help hold small gear from falling out the bottom and rarely get in the way. Straps hold everything from the flaps to the shoulders and the waist. If the straps are too short, you can't fit a big backpack in the center of your pad. Taco pads generally store more gear with greater ease than the hinge style pads. Last is the stiffness factor. This only affects the hinge style pads — the stiffer the pad, the harder it is to pack (and the more it squishes your bag of chips). Some pads are just not able to fit big packs in the middle. Our testers preferred to carry their belongings in a small day bag inside the crash pad versus stuffing all of their stuff loosely. If you like to boulder with a backpack full of shoes, food, and random goodies, make sure your pad can carry it.

Sean Brady hikes into a new area near Castle Rock CA wearing the new...
Sean Brady hikes into a new area near Castle Rock CA wearing the new Petzl Alto bouldering pad and the Metolius Session balanced on top.
Photo: Chris Summit

All around portability

When moving the pad a short distance, from boulder to boulder, it is often easier to carry it rather than put it on your back. This is done by grabbing any available handles on the top or sides. This is also important when loading it into or out of a vehicle or just moving it around anywhere. The placement and quality of the handles are vital. We love when a pad has a burly handle right over the shoulder straps. This helps get it on when the pad is really loaded with gear.

One last handle to look for, especially on a big pad: a strap right in the middle of the pad at the folding point. This makes it easy to pick up the pad and walk short distances. We prefer there to be suitcase handles on both the folded side, so that our gear could be carried inside like a basket, and at the hinge.


Everyone prefers varying levels of stiffness in the bed they sleep. Same with pads. If you like a stiff mattress and plan on using your crash pad for crashing on, then you might want a stiffer pad, or vice versa. Since pads are not meant for sleeping on and sleeping pads are affordable, then you should obviously not worry about this too much. The most important factor is size. Most truck beds will accommodate any size pad. A station wagon might not.


Some pads come with pockets, but they are usually just an annoyance. Anything other than padding in the landing zone is not okay. The placement of pockets on crashpads generally means that the items could be landed on defeating the purpose of the crashpad. I've been bouldering with people who carry things in the side pockets of pads, and I have almost stepped on sunglasses and cell phones. It's very annoying to have to step over the pocket of goodies. Pockets are ok for bringing items to the boulders, but we strongly recommend emptying them before you begin climbing.


Not only are the best design and craftsmanship needed to make a great product, but the third and final ingredient is the best materials. Most pads are made out of Nylon, Cordura Nylon and some have an auto upholstery top or a velvet top side. Auto upholstery or velvet makes the best topside fabrics because they are better for wiping dirt off your feet and lounging around on. And let's be honest, how comfortable a pad is to lounge around on is very important.

One cool thing about the bouldering pad industry is there are still some very small companies offering made-to-order products. For example, with Voodoo and Organic, you can select a variety of color schemes and fabrics.

Most pads are made of ballistic nylon. All manufacturers like to mention how much burlier their nylon is than their competitors. However, we didn't find a giant difference in the durability of the different nylons. Yes, the thinner nylon wears out faster, but even the burliest foam wears out faster than the thinner nylon. Focus on the foam, not the nylon that surrounds it.

Mark Nicholas above the Black Diamond Mondo Pad at the Deli Slicer...
Mark Nicholas above the Black Diamond Mondo Pad at the Deli Slicer, South Lake Tahoe.
Photo: Chris McNamara

Ankle Protection

There are two important factors in pad design that can lead to a higher probability of an ankle getting rolled: the thickness of foam and foam stiffness. When you have thick foam there is a greater chance that only half your foot will land on the pad and it will roll. This problem is made even worse if the pad is extra stiff. However, it is stiff and thick foam that makes a pad best able to absorb impact from a big fall. So there is a tradeoff here. One solution that legendary boulderer John Sherman has come up with is to cut slits around the edges of the foam. If you are considering doing this, consult someone who has done it before. We don't want you to kill your pad!

Chris Mac taking big falls on the pads. OGL crash pad testing!
Chris Mac taking big falls on the pads. OGL crash pad testing!
Photo: Chris Summit

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