Securely attaches to most hard hats with add Neck Flap The pocket in the front of the brim secures it to the hard hat peak, and elasticated loops attach to the hard hat harness Wide brim made from durable cotton drill UPF 50+ Excellent Protection Double sided construction with flexible brimlock edging The earmuff version allows for most types of hard hat earmuff attachments Complies with AS/NZS 4399:2017 Sun protective clothing ? Evaluation and Classification