Choosing the right level
Cut levels range from A (light) to F (very high) according to the ISO 13997 test. For warehouse and assembly work, B is usually sufficient; for sheet metal, glass and knives, choose C or D; and for metalworking or meat processing, E or F. The highest level isn't automatically the best: the higher it goes, the thicker and stiffer the glove, and a glove that comes off protects nothing.
Cut-resistant isn't stab-resistant
A cut-resistant glove withstands a knife sliding across the material, but doesn't stop a straight stabbing blow; separate chainmail gloves exist for that. When working with heavy material, combine with impact protection, and use a safety knife when unpacking boxes.