Low odor resistance means the fabric has no antimicrobial treatment, so bacteria and odor build up within hours of active wear. These are typically basic, untreated synthetic materials like standard polyester.
For single-day resort skiing where you can wash them right after, low odor resistance works fine. You'll still stay warm and dry on the slopes—the odor only becomes noticeable after you're done riding. Just don't plan to re-wear them the next day without washing.
The real issue comes on multi-day ski trips. If you're staying at a lodge or backcountry hut without laundry access, these base layers will smell by day two and become unpleasant for everyone in close quarters. Also, never stuff a damp synthetic base layer into your ski bag after riding—that traps moisture and can create permanent odor that won't wash out.