The Boost Wristband by Colantotte Trion:Z Combines a sleek new look with the unique magnetic technology found in all Colantotte Trion:Z Products. The silicone bands and narrow magnet housing allow for a durable and comfortable fit making this product both water and sweat resistant. The Boost Wristband contains two, 100mT (1,000 Gauss) magnets arranged in our unique Alternating North-South Polarity Orientation (ANSPO) to create a larger magnetic field flow. The Boost wristband is available in 3 sizes and in 3 different color options including: Black, White and Red. Small 15-17 cm Medium 17-19 cm Large 19-21 cm.