I have the te WA that you speak of and I love it.
Construction is very good quality and it has worked for me very well in the 40s. I haven't had a chance to test its lower limits, but its been said I can take mine, with the overstuff, to approximately 31
"In seed time learn, in harvest teach, in winter enjoy." -D'Signore's, Tide Mill Farm, Edmunds, Maine.