The Black Diamond Project Heavy Flannel is a men's flannel shirt woven from heavyweight, brushed organic cotton twill. The boxy cut leaves room for layers underneath, so it slides over a base layer or midlayer without pulling across the shoulders. What Our Gearhead® Experts Are Saying:"The thick cotton holds off the chill on cold morning belays until the sun clears the wall. When the temperature drops further, I put a puffy over it, because a flannel adds warmth without replacing insulation." Heavy flannel shirt for cold bouldering days 100% organic cotton reduces environmental impact Double chest pockets hold small essentials Regular fit leaves room for layers underneath
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First seen in Oct 2026
BLACK DIAMOND Project Heavy Flannel In Multi
$119 $84
(29% OFF)
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