A band clasp comprises a ratchet assembly at a first end of a band, the ratchet assembly including a plate having a rim that defines an aperture that extends along a length of the first end, the ratchet assembly further including a track that extends along the length of the first end beneath the plate, the track having a first side and a second side, the first side including a first plurality of teeth opposing a second plurality of teeth of the second side. The band clasp further comprises a pawl assembly disposed at a second end of the band opposite the first end, the pawl assembly including opposing pawls having an outward bias, the opposing pawls configured to engage the rim and opposing teeth of the track through the aperture to fasten the first end of the band to the second end of the band.