IRCO (India Rubber Company?) - someone correct me as having trouble tracking the line of events - a byproduct of Goodyear I believe. BTW v interesting history of Charles Goodyear and his place in Boston history over at JasonTurgeon. Absolutely bonkers vulcanized batman/60s policeman style rain-cape/jac found upstairs in the deadstock area of Hilton's Tent City in Boston by the Garden. $10. There are more - go see. Some made in Japan, some in USA, some with hoods - whatever your flavor.
What is 'vulcanized' you ask? Rubber mixed with sulphur - fond out bby Charles Goodyear, that stops it melting in the heat or cracking in the cold. Hence the weird smell of many older rubber goods.
BTW HTC are moving and having sales on the store contents - good time to stop by. Believe they may be the #1 seller of Filson outside Seattle.
On the Batman theme... neat new doc coming out about the original creator of many of the clasisc Batman elements - Bill Finger (early partner but overshadowed by Bob Kane).