This proposal is an advanced feasibility study based on success demonstrated in Phase I for our invented selective permeable elastomeric membranes of 1-2 mil thick for (1) impermeable to chemical and biological warfare agents, (2) sufficient moisture vapor transport rate, and (3) durable to field usage subject to flexing, abrasion, and POL contamination. The proposed work involves with optimization of recipes and prototyping for field test and evaluation. The invented membranes could also be used in low cost chemical industrial protective suits and consumer waterproof breathable clothing