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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).

By the Numbers: the Search for a High-MVTR Waterproof Breathable Shell Jacket

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?

Why You Should Spend a Few Ounces of Pack Weight on Rainwear Ventilation Features

In this article, we make the case for spending some extra weight on rain jackets and rain pants that offer more ventilation features (and durability) than typical ultralight rainwear styles.

Helly Hansen Odin Minimalist 2.0 Jacket Review

The Helly Hansen Odin Minimalist 2.0 jacket (180 g / 6.35 oz, $220) is a lightweight 2.5-layer rain jacket with a well-designed hood and minimal features.

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