Thompson Tee Inc created the Thompson Tee with Hydro-Shield Sweat Proof Technology to provide a reliable, convenient, and affordable solution for those who are concerned with excessive underarm sweat (Axillary Hyperhidrosis) and yellow staining. Their journey started over 10 years ago to create a special undershirt with truly integrated underarm sweat proof barriers (not just sewn on patches, or doubled up layers) that would offer the same conveniences of a regular premium undershirt. It was important that their sweat proof shirt could be machine washed and dried, was comfortable to wear, and most importantly, provided a breathable sweat proof barrier to keep perspiration from reaching the outer garment.