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Yeah if it's strictly winter go 5mm neoprenes. It's best to be able to try them on before buying, and try them on as you'll be wearing them out in the field. That is, the last time I was buying waders at basspro I yanked a pair of socks off the shelf, put them both on one foot and then made sure it would a) fit in the stockingfoot and b) everything fit into the wading boot.
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depends
When I used to steelhead fish insulated neos did the trick. On the cumberald river they also do the job, that water stays cold most of the year.In streams a wading staff attached to the suspenders is nice to have.A good bely to cinch them tight is a life saver.I've had both the boot and stocking, and used them both, boot are harder to get comfortable. I also waded a lot on the gulf and heavier neos were a good bet in case you stepped on a ray.