Jams,

They might just want to try to test for DNA on the cotton fibers, if they haven't already. When I use this type of glove for running, they
server to absorb sweat off my face and let's just say to keep my face clean. There may be sweat, saliva, mucous, or other fluids on them that can be evaluated. This may not have occurred to the investigators because other types of gloves wouldn't necessarily be such good sources. These gloves are very absorptive. If you so much as touch your face, they'll absorb something.

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One-eyed Jack,

Did they catch these burglars? If so, can you speculate as to why they wore that type of glove? I just can't imagine it unless I couldn't afford any others. They would be easy to steal, however, from a grocery store. And they do expand quite a bit before they're washed --- meaning that someone with large hands can easily find and steal something that fits.