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 (Updated)
Stephen Seeber helps us answer the question, "do air-permeable garments allow a noticeable amount of ventilation while hiking or running?"
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).
How does vapor pressure differential influence condensation in tents?
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.
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?
Is Mountain Hardwear AirMesh a breakthrough product or a prisoner of wicking base-layer physics?
Sometimes a wet base layer just can't be avoided. Soaked-based layers happen. Here is why it will happen to you.
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.
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.
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.
BatteryBench: A Protocol for Testing Portable Battery Chargers and Electronic Devices for Backpacking
Rex Sanders runs through an extensive protocol for testing portable battery chargers and electronic devices.
How bad does high-loft synthetic insulation (Climashield Apex and Primaloft Gold) degrade when subjected to repeated compression cycles? What's the impact on backpacking gear and apparel?
How Effective are Backflushing and Storage Practices for Backcountry Squeeze Filters Using Hollow-Fiber Membrane Technology?
We provide data that evaluates backflushing and storage in maintaining flow rates of the Platypus Quickdraw, Sawyer Squeeze, and Katadyn Befree hollow-fiber membrane squeeze filters.
A high MVTR waterproof-breathable shell jacket may be the holy grail that can replace both a wind shirt and a rain jacket. Do they exist, and where do we find them?
In part two of this investigation, we see what happens when you crush insulation beneath a stack of concrete pavers - again and again.
What is MVTR's role in active insulation garments?
In his new column, Simple Gear Tests, Backpacking Light author Rex Sanders provides suggestions for at-home gear tests you can do with minimal time and expense. First up - a plan for verifying the capacity of your USB-rechargeable devices.
Air permeability vs. moisture vapor transmission rate (MVTR): which one impacts moisture transport more in wind and rain jackets?
This study compares the performance of four jackets made with fabrics that span a wide range of air permeability rates and moisture vapor transmission rates (MVTR). The study shows that significantly greater moisture removal can be achieved as a function of jacket MVTR than jacket air permeability.