One of the best sources for gear knowledge is your local outfitter. They should help you find just the right piece of gear and help with any sizing issues. They usually also offer great recommendations for local hikes.
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Local New Mexico Camping Stores
Sangre De Cristo Mtn Works Inc, 328 South Guadalupe Street Santa Fe, NM 87501 (505) 984-8221
121 Sandoval Street Santa Fe, NM 87501 (505) 983-5155
3801-A Arkansas Avenue Los Alamos, NM 87544 (505) 661-3663
Mountains And Rivers
2320 Central SE Albuquerque, NM 87106 (505) 268-4876