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When ready to use, simply remove The UnderWarmer® from its packaging. Upon opening, heat activation begins and will take approximately 30 minutes to reach its maximum temperature of over 100f/38c.<br />\n<strong>Sizing:</strong>\n<ul>\n\t<li>Small Chest: 30 – 34 inches</li>\n\t<li>Medium Chest: 35- 39 inches</li>\n\t<li>Large Chest: 40 – 44 inches</li>\n\t<li>X-Large Chest: 45 – 49 inches</li>\n\t<li>Weight: 1 lb</li>\n\t<li>Dimensions: 10.5" x 9.5" x 1.5"</li>\n</ul>\n\nFeatures:\n\u003cul>\n\u003cli>Compression fit\u003c/li>\n\u003cli>Soft, lightweight compression vest\u003c/li>\n\u003cli>Air activated and ready in 30 minutes\u003c/li>\n\u003cli>8 Built in heat packs\u003c/li>\n\u003cli>Feel snug and toasty\u003c/li>\n\u003cli>ReSeal and ReUse\u003c/li>\n\u003cli>Perfect for cold weather\u003c/li>\n\u003cli>Great for football fans\u003c/li>\n\u003c/ul>\n\nSpecifications:\n\u003cul>\n\u003cli>100% Spandex\u003c/li>\n\u003c/ul>\n"