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Advances in Materials and Manufacturing in Ultralight Backpacks: A Technical Review and Case Study
A technical analysis of material and manufacturing innovations in ultralight backpack design, with a case study of the Arc'teryx Alpha SL 30. This report examines fusion bonding, molecularly bonded UHMWPE laminates, and the engineering tradeoffs shaping the next generation of ultralight packs.
By the Numbers: Can New GPS Technology Save Your Life? Under the Right Conditions, it just Might
Stephen Seeber compares iPhone and Garmin Fenix GPS tracks for accuracy and reliability.
LightBench: A Laboratory Testing Procotol for Comparing the Performance of Flashlights and Headlamps
In this technical brief, we quantitatively evaluate the performance of lights considering brightness, battery life, and weight into an objective Lightbench Index.
How Fishnet Works (Base Layer Fabric Structures)
This article explores how fishnet base layers offer superior moisture management and comfort for cold-weather backpacking by promoting rapid moisture vapor transport and minimizing condensation.
By the Numbers: How does Tent Design and Materials Influence Cold-Weather Camping Comfort?
An overview of the complex heat exchange mechanisms between the tent occupant and the outside environment - and how to test tent construction's impact on comfort.
How do tent stakes interact with soils to create holding power?
Tent stake holding power, especially in adverse wind conditions, relies on principles of engineering and physics, including cross-sectional shape, length, soil interaction, and insertion angle.
Shell Game: Wind and Rain Jacket Breathability Tests vs. Trail Performance
I sent several top wind and rain shells to the lab to measure breathability and then took them on the trail for real-world testing.
What Properties Influence the Air Permeability of Wind Shirt Fabrics?
The purpose of this report is to investigate the relationship between air permeability, fabric porosity, weave type, and yarn structure via photomicrography and image analysis. This is not an exhaustive research study, but rather, an exploration of some of the fabric design attributes that have an impact on air permeability rates.
By The Numbers Fabric Air Permeability and MVTR are Closely Related, Just Not How You Might Expect
This work explores the relationship between air permeability and MVTR in fabrics that do not include a waterproof membrane.
By The Numbers – How Much Wind Penetrates Your Air Permeable Outer Layer at Hiking and Running Speeds?
Stephen Seeber helps us answer the question, "do air-permeable garments allow a noticeable amount of ventilation while hiking or running?"
By the Numbers: The Myth of Air Permeability in Windshirts
If one of your objectives in selecting a windshirt is eliminating moisture vapor, your selection should rely more heavily on Moisture Vapor Transmission Rate (MVTR) than Air Permeability Measurements (APM / CFM).
Using vapor pressure differential to predict condensation in tents
How does vapor pressure differential influence condensation in tents?
By The Numbers: What’s the Best Base Layer Fabric? Wool vs. Alpaca vs. Polyester
In this paper, I subject base layers in various weights made from merino, merino blends, and alpaca to the suite of tests I have developed to evaluate base layer performance. I then compare the performance of these base layers with those of the polyester base layers I have recently reviewed. We also see if my preconceived notions about merino hold water. Finally, we will see how to choose the fiber for our base layers.
How to Store Freeze-dried Food
Best practices for storing your freeze-dried food (plus one killer chiles rellenos recipe).
By The Numbers: Patagonia Capilene Thermal Weight vs. Patagonia Capilene Midweight Performance Comparison
How does Patagonia Thermal Weight Capilene stack up against Midweight Capilene?
By The Numbers: Testing the Performance of Mountain Hardwear AirMesh Garments
Is Mountain Hardwear AirMesh a breakthrough product or a prisoner of wicking base-layer physics?
Why is my base layer soaked?
Sometimes a wet base layer just can't be avoided. Soaked-based layers happen. Here is why it will happen to you.
Sunscreen for Hiking and Backpacking: Efficacy, Ingredient Safety, and Best Practices
Dan Hu reviews current research regarding the safety and efficacy of sunscreen for hiking and backpacking, including ingredient efficacy, safety, and best practices for outdoor adventuring.
By the Numbers: Compression Resistance of PrimaLoft Gold vs. Climashield Apex (Part 4)
PrimaLoft Gold outperforms Climashield Apex as the more resilient (durable) insulation, capable of retaining more of its original warmth and loft in response to repeated compression.
Do moisture-wicking fabrics work?
Moisture-wicking fabrics (base layers and underwear) are designed to move sweat away from the skin. In this study, we test if Polartec and other base layer fabrics meet manufacturer claims.
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