• Nothing. Marmot's soft shells use a tiered system of categorization: M1 is the most warm, most weather protection, has the least stretch and is the least breathable. M2 is the middle ground, and M3 soft shells are highly stretchy, highly active/breathable, and provide the least weather protection. The Estes jacket falls in the M3 category
    Answered on 2/9/2017 8:16:17 PM by Spencer Owen from Colorado Springs