BREATHABILITY OF THE FABRIC (RET)
To see whether a fabric is breathable, we test its evaporative resistance or RET (based on the ISO 11092 standard). The lower its resistance, the more it lets water vapour produced by the body escape, therefore the more breathable it is.
• RET <6: extremely breathable, suitable for the most intense workouts
• RET 6 to 12: very breathable, designed for moderate exercise
• RET 12 to 20: moderately breathable, not enough for exercise
• RET >20: little breathability, unsuitable for exercise