Messe Property Co., Ltd. (Headquarters: Minato-ku, Tokyo, Representative Director: Shigeru Miyamoto), which promotes next-generation living spaces and hot spring businesses, announces that its hot spring facilities in the Chuo Line area, "ROOFTOP (Nishi-Ogikubo)," "MONSTER WORK & SAUNA (Kichijoji)," and "FLOBA (Mitaka)," will collaborate with the specialized sauna hat brand "Best Sauna Hat" to release the mascot charm "Limited Mesh-kun" in limited quantities starting July 3, 2026 (Fri). This product is based on Best Sauna Hat's popular mascot "Mesh-kun," with three facility-exclusive colors reflecting the concept and spatial image of each facility. It will be offered as a limited design expressing the individuality of each facility for sauna fans. Messe Property positions July 3rd as "Reverse Sauna Day" because reading the number "73" backward sounds like "sauna," and holds various events annually. As part of this initiative this year, in addition to the limited charm release in collaboration with Best Sauna Hat, a Tanabata event will also be held jointly by the three facilities. ■ About the Collaboration with Best Sauna Hat We have collaborated with Best Sauna Hat more than five times previously. Our collaborative sauna hats sold in the past were well-received, selling out after their release, and we have received many requests from customers for new collaborations. The "Limited Mesh-kun" being sold this time is based on Best Sauna Hat's popular mascot charm, with facility-exclusive colors reflecting the concept and spatial image of each facility. All three types will be released, expressing the individuality of ROOFTOP, MONSTER WORK & SAUNA, and FLOBA. 【Sales Overview】 Product Name: Best Sauna Hat x ROOFTOP / MONSTER WORK & SAUNA / FLOBA "Mesh-kun" Sales Period: July 3, 2026 (Fri) 8:00 AM~ *Limited quantity, sales will end once sold out. Sales Price: ¥3,800 each (tax included) Sales Locations: ROOFTOP (Nishi-Ogikubo), MONSTER WORK & SAUNA (Kichijoji), FLOBA (Mitak