A strap adjustor for a helmet , comprising: a top surface ; a bottom surface opposite the top surface in a thickness direction (z) of the strap adjustor; an upper surface that extends between the top surface and the bottom surface ; a lower surface opposite the upper surface in a length direction (y) of the strap adjustor; a front surface ; a back surface opposite the front surface in a width direction (x) of the strap adjustor, the top surface being bordered by the upper surface , the lower surface , the front surface , and the back surface ; a first through opening that extends from the top surface towards the bottom surface ; a first end opening that extends from the upper surface to the first through opening ; characterized in that : the strap adjustor comprises a second through opening that extends through the strap adjustor from the top surface toward the bottom surface ; the strap adjustor comprises a bar separating the first through opening and the second through opening , the bar extending between the front surface and the back surface ; and the strap adjustor comprises a second end opening offset and separate from the first end opening in the width direction (x), the second end opening extending from the upper surface to the first through opening , the first end opening and the second end opening being aligned with angles of the front surface and the back surface the strap adjustor is configured to receive a first strap and a second strap at different relative angles with the first strap being disposed through the first end opening , through the first through opening , and over the bar , and the second strap being disposed through the second end opening , through the first through opening and over the bar . a top surface ; a bottom surface opposite the top surface in a thickness direction (z) of the strap adjustor; an upper surface that extends between the top surface and the bottom surface ; a lower surface opposite the upper surface in a length direction (y) of the strap adjustor; a front surface ; a back surface opposite the front surface in a width direction (x) of the strap adjustor, the top surface being bordered by the upper surface , the lower surface , the front surface , and the back surface ; a first through opening that extends from the top surface towards the bottom surface ; a first end opening that extends from the upper surface to the first through opening ; the strap adjustor comprises a second through opening that extends through the strap adjustor from the top surface toward the bottom surface ; the strap adjustor comprises a bar separating the first through opening and the second through opening , the bar extending between the front surface and the back surface ; and the strap adjustor comprises a second end opening offset and separate from the first end opening in the width direction (x), the second end opening extending from the upper surface to the first through opening , the first end opening and the second end opening being aligned with angles of the front surface and the back surface the strap adjustor is configured to receive a first strap and a second strap at different relative angles with the first strap being disposed through the first end opening , through the first through opening , and over the bar , and the second strap being disposed through the second end opening , through the first through opening and over the bar . <EOS>