Przewalski Classic All-Terrain Chamois Technical Overview

This article explains how the “All-Terrain Chamois” in the Przewalski Classic Bib Shorts was designed and how it works in real riding.

We will not use too much marketing language. Instead, we will start with a few simple questions:

• Who is this chamois made for?
• How does it support different riding positions?
• Why did we choose this thickness, density, and layered structure?
• What was done to improve breathability, fit, and stability?

If you are thinking about buying the Przewalski Classic Bib Shorts and want to know whether the chamois fits your riding style, this article will give you a clear answer.

Design Goal: Support 4-Hour Rides and All-Terrain Riding

When we designed this chamois, our main goal was clear: to provide effective support for rides up to 4 hours and to handle different road surfaces.

Whether you ride in a more upright beginner position or in a lower riding position between 20° and 55°, you should still get stable support under the sit bones and perineal area, so you can stay comfortable throughout the ride.

To make that possible, we had to rethink the chamois structure in several ways:

• Support and pressure relief for the sit bone and perineal areas
• How pressure changes at different forward riding angles
• Comfort and stability during rides of up to 4 hours
• Shock and vibration from road, mountain, and gravel riding

The Przewalski Classic chamois was developed with these 4-hour, all-terrain riding needs in mind.

Foam Structure: Multi-Layer, High-Density, All-Terrain Support

The Classic Bib Shorts use a chamois designed for all-terrain riding. It has three key features:

1. High density
2. Multi-layer structure
3. Reinforced support in different pressure zones

Sit Bone and Perineal Area: Targeted Support with 90 kg/m³ High-Density Foam

The sit bone and perineal areas are the key pressure zones across different riding positions.

To support these zones, we use:

• Sit bone area: 1.8 cm thick, built with two layers of 90 kg/m³ high-density foam

（ Please allow slight variations due to manual measurement.）

• Perineal area: 1.3 cm thick, built with one layer of 90 kg/m³ high-density foam

（ Please allow slight variations due to manual measurement.）

This structure helps deliver:

• reliable cushioning and support for beginners in a more upright riding position
• stable support for lower riding positions and longer rides, without feeling overly soft or collapsing under pressure

Perineal Area: 3-Layer Structure (30 + 90 + 30 kg/m³)

When your upper body angle becomes lower, such as 40° or even 20°, pressure on the perineal area increases clearly.

To handle this, we use:

• 3-layer structure: 30 + 90 + 30 kg/m³

Why this structure works:

• The outer 30 kg/m³ layer gives a softer touch and smoother contact
• The middle 7mm layer made of 90 kg/m³ foam provides the main support and helps reduce direct pressure on soft tissue.

• The inner 30 kg/m³ layer works with the shorts and the base layer of the chamois to keep the whole structure stable and comfortable

This helps the chamois give real support and pressure relief even in a more aggressive, lower riding position.

Sit Bone Area: 4-Layer Structure (30 + 90 + 90 + 30 kg/m³)

The sit bones are a key support point in every riding position, especially for:

• Beginners with a more upright position
• More experienced riders doing medium-intensity rides of up to 4 hours

In the sit bone area, we use a stronger reinforced structure:

• 4-layer structure: 30 + 90 + 90 + 30 kg/m³

Here is how it works:

• The double 90 kg/m³ center layers form the main support core, so the pad does not flatten too easily under long periods of pressure
• The 30 kg/m³ layers on both sides create a smoother transition to nearby areas, so the chamois does not feel too hard or uneven

The result is simple:

Whether you are new to cycling or already used to longer rides, the sit bone area gives solid support instead of making you shift around in the saddle halfway through the ride.

(The sit bone area uses a dual-layer foam construction with a final measured thickness of 13.2 mm. It is formed by bonding two 7 mm layers of 90 kg/m³ high-density foam. Because the foam is compressed during the bonding process, the final thickness is slightly below 14 mm.)

Ride Time and Terrain Use

Based on its thickness and density, this chamois is designed for:

• Effective support for rides of up to around 4 hours
• Different types of riding surfaces, including road, mountain, and gravel

It is not an extra-thick pad made only for extreme long-distance riding. It is a balanced all-terrain chamois built for training rides, daily longer rides, and mixed-surface use.

Support Across Different Riding Positions

When we developed this chamois, we focused on several common riding positions:

• Around 55° upper body angle: relaxed riding, entry-level road riding, or commuting
• Around 40° upper body angle: common road training and steady riding
• Around 20° upper body angle: more aggressive riding, sprinting, descending, or deep riding posture

As the rider leans farther forward:

• Pressure on the sit bones becomes slightly lower
• Pressure on the perineal area becomes higher

We used different layered designs in the sit bone and perineal areas so pressure can be spread more evenly in each position:

• In a more upright position: the 4-layer high-density sit bone area takes most of the load
• In a moderate forward position: the transition area between the sit bones and the perineal zone starts to carry more of the pressure
• In a lower, more aggressive position: the 3-layer perineal structure handles more forward and vertical pressure and helps reduce pressure on soft tissue

In short, this chamois is not made for only one riding position. It is made to give smooth and stable support across a full range of riding styles, from casual riding to training to more aggressive riding.

Breathability and Fit: The Difference You Feel on Longer Rides

On longer rides, a good chamois does not only need to support you. It also needs to stay comfortable against your body.

To do that, we added several important details for breathability and fit.

Fully Perforated Surface

The full surface of the chamois is perforated.

This helps:

• Increase airflow
• Reduce heat and moisture build-up between the body and the chamois
• Improve comfort in hot weather, climbing, and indoor training

This is especially useful for riders who sweat more or spend a lot of time on indoor trainers.

Side Wing Folds: Better Fit Around the Upper Thigh

The side wing area of the chamois includes special fold lines.

These folds help:

• The chamois bend more naturally around the upper thigh area
• Reduce friction during repeated pedaling
• Lower the risk of rubbing, especially during high-cadence or longer rides

Front Wing Folds: Less Pressure on Sensitive Areas

The front part of the chamois also includes fold lines, with a clear purpose:

• Reduce pressure from the front edge of the chamois in some riding positions
• Lower front-area discomfort during longer rides

This is not only about making the front thinner. It is about using structure and fold lines so the chamois can change shape slightly with your body position.

Stitching: Keeping the Chamois in the Right Place

Even a well-designed chamois cannot work well if it keeps moving forward, backward, or to one side while riding.

That is why we use a special herringbone stitching method to connect the chamois to the shorts.

Herringbone Stitching: A More Stable Way to Fix the Chamois

Compared with regular stitching, herringbone stitching gives two important advantages in the chamois area:

1. Better structural stability, which helps reduce chamois movement during riding
2. Stronger edge connection between the chamois and the fabric, which improves durability through repeated use and washing

In real riding, this means:

• When you pedal, stand up, sit down, or move side to side on the bike, the chamois is less likely to shift out of place
• Your sit bones and perineal area stay on the support zones that were designed for them

This kind of stitching is more often seen in higher-end bib shorts. We chose to use it in the Classic Bib Shorts because long-term stability matters more to us than lower cost.

Chamois Fabric: Material Choice for the Top and Bottom Layers

For both the top layer and the bottom layer of the chamois, we use the same fabric blend:

• 85% polyester
• 15% spandex

We chose this fabric for three reasons:

• Polyester gives good moisture control and durability
• Spandex adds stretch, helping the fabric move with the body and the chamois without creating stiff wrinkles
• Using the same material on both layers helps the whole chamois keep a more stable structure over time

Together with the fully perforated surface, this fabric setup gives more balanced breathability and moisture control.

What Kind of Riding Is This Chamois Best For?

Looking at all of its design features together, this chamois is best described like this:

• Made for rides of up to around 4 hours
• Built for different terrain, including road, mountain, and gravel
• Designed for different riding positions, from more upright commuting and casual riding to moderate forward training positions and lower, more aggressive positions

If your riding includes:

• Weekday commuting plus 2–4 hour weekend training rides
• Indoor trainer workouts such as power sessions and interval training
• Longer mixed-surface rides across different terrain

Then this chamois was designed for exactly that kind of use.

It is not a pad that only tries to feel thick. It is an all-terrain chamois built to balance support, pressure relief, breathability, fit, and stability.