Tampons wick away fluid, it’s their primary purpose. Vaginas are never meant to be dry. If you wear a tampon that is designed to wick away a lot of moisture on a low flow day it will dry you out which may cause an infection and lead to toxic shock syndrome - TSS. The L is low, R is regular, but higher ones exists. The goal is to use the lowest absorbancy necessary.

This page has a pretty good article about it.