The use of natural fibers prevents any type of allergies and has generally superior hygroscopic performance Cotton is a fiber of vegetable origin and is totally natural Cotton fabrics are generally fresher, prevent odors and retain their appearance and characteristics over time The elastan and / or other substances that make the fibers elastic, are of chemical derivation, but are widely used in percentage to give greater elasticity (and consequently comfort) to the natural fabrics which by their nature are fix. Obviously this compromise on the one hand gives more comfort but on the other it tends to make a natural fabric lose some of it's most important peculiarities (anallergicity, freshness, naturalness ...) Our patent allows, thanks to a special construction, to make a shirt with 100% cotton fabric with a new concept of comfort. Generally the most critical part of the shirt is the back, as it brake a lot of the movements of the person, our Flexi, thanks to a particular construction system, has instead an elastic back.