• They're pretty much all air only, with no insulating material. Only suitable for very warm conditions, I never recommend them.

  • I'm ok with that, won't be using anywhere cold.

    But otherwise - durability? Comfort / pack size etc?

  • They're pretty much all air only, with no insulating material.

    Unless I'm missing an "/s" here, isn't the purpose of insulation to trap air?

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