Each pair of Kaenons is a finely tuned instrument, purpose-built for a life lived outside. Their proprietary SR-91®️ and SR-91ULTRA™️ are The Most Advanced Polarized Lenses on the Planet. Tested and worn by world-class adventurers and opticians to provide the best vision for a life lived outside. No other lens can match SR-91®️’s performance. Cleary Better.