Lacrosse® 1,000 Gram ThinsulateTM Ultra Mallard II Expandable Waders. Impervious armor for the mighty hunter... with an expandable upper for a just-right fit!Naturally-insulated neoprene meets an outer layer of LaCrosse's abrasion-resistant Brush Tuff® material. This brings an added measure of in-the-field toughness to neoprene's stretchy, personalized fit! And speaking of fit, expandable uppers adjust to give you a little more room to work with when needed. Add to all that the 1,000-gram Thinsulate Ultra Insulation in the boots, and these Waders provide the performance needed in all cold-water environments.