YOU CAN'T RUN WITHOUT BREATHING
Your perspiration is absorbed by the synthetic fabric and dries very quickly so that you stay dry throughout your run.
AND WHAT ABOUT THE SEAMS?
These boxers have offset seams at the crotch. No seams in this area to avoid irritation.
However, for those with sensitive thighs, we recommend models without a rear seam:
900 perf running boxers (seamless technology)
https://www.decathlon.fr/p/boxer-de-running-homme-dry-perf-900/_/R-p-334341?mc=8677528
or
Fitness boxers (cotton)
https://www.decathlon.fr/p/lot-x3-boxer-fitness-homme-500/_/R-p-335567?mc=8667431