  Metglas 2705M is a low-cost commercially-available, high-permeability
Cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-$\mu$m thick
ribbon foil. We present an optimized construction technique for single-shell,
large-scale (human-size), thin, open-ended cylindrical Metglas magnetic
shields. The measured DC axial and transverse magnetic shielding factors of our
0.61-m diameter and 1.83-m long shields in the Earth's magnetic field were 267
and 1500, for material thicknesses of only 122 $\mu$m (i.e., 6 foil layers).
The axial shielding performance of our single-shell Metglas magnetic shields,
obtained without the use of magnetic shaking techniques, is comparable to the
performance of significantly thicker, multiple-shell, open-ended Metglas
magnetic shields in comparable-magnitude, low-frequency applied external fields
reported previously in the literature.
