GX-SONIC V is a multi racer model for mid- to long-distance races. FINA (International Swimming Federation) approved? Flat swim technology, Mizuno’s top race swimwear GX-SONIC series? Sonic Light Ribtex UW with improved water repellent performance by cutting-edge technology, lightweight feel underwater 20% more (compared to men’s swimwear)? Sonic Line Design-X: dynamic Sonic Line Design-X: Lining area design and cross-shaped support lines based on the analysis method “musculoskeletal simulation” The feel of this product differs from other swimsuits due to the use of woven materials and the characteristics of its high compression design, and it also takes time to wear. Flat Swim Technology? Reduces resistance on the body by maintaining a flat posture. The swimsuit supports the muscles from the torso and hamstrings to the hips, and significantly reduces water resistance by maintaining a flat posture with minimal water resistance. International Buyers – Please Note. We do not mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior. Thank you for your understanding. We are based in Japan. Thank you for looking at our items. We sell a lot of nice and rare products from Japan. Please have a look at our other items if you like.