Retailers' Descriptions

Here's what other sites are saying:

This Nitro Vest hits central truths: keep that core warm. This vest has Thermal R Active insulation and a stretch jersey polyester back, making this piece both warm and breathable for cold training days.

- Summit Hut

Keep your core cozy on winter runs with the Marmot Nitro vest. With toasty insulation and a stretch jersey back, it's both warm and breathable for cold training days.

- REI

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