This nine-ounce shoulder sling may be the most important piece of life-saving equipment you can wear when traveling in avalanche terrain. Allows an avalanche victim to breathe fresh air directly from the snowpack. Diverts CO2 away from fresh-air intake. S/M fits 100-160 lb; M/L fits 150-225 lb. Wt: 9.3 oz. (S/M), 10.1 oz. (M/L).