Ear (3) has an IP54 protection rating (Level 5 dustproof and Level 4 waterproof), which is based on the IEC 60529 testing standard, and was tested under controlled laboratory conditions. The charging case, however, isn't waterproof.
Ear (3) is not designed for swimming or other water sports and should not be used in the shower. If you use the earbuds while training, sweating heavily or around water that may splash onto the buds, please wipe them clean with a soft, dry, lint-free cloth before placing them back in the charging case. Do not use heat or compressed air to dry the earbuds.
Please note that damage caused by immersion in liquid is not covered under the warranty.