Are the Haflinger AT Hard Sole and the Nordkap the same slipper?

Yes. Both list model AT74 with the same boiled wool upper, 10mm felt sole, latex midsole and rubber outsole. Pick by size and color availability.

Which is better for wearing outside?

Both have the same hard rubber outsole, which handles quick trips to the mailbox or porch. Neither is a walking shoe; the wool upper wears through with heavy outdoor use.

Do they run true to size?

They tend to run short. Many owners size up, especially if you wear thick socks or have a wide foot.

Are they good for sweaty feet?

Yes. Boiled wool wicks moisture and regulates temperature, so feet stay warm without overheating. That is the main reason owners choose them over synthetic slippers.

Is the Nordkap worth stepping up to over the AT?

There is nothing to step up to. They are the same slipper, so choose the listing with your size and preferred color.

Haflinger AT Hard Sole Slipper vs Haflinger Nordkap Wool Slippers

Q: Which lasts longer?

They should wear the same. Owners of both report holes near the toes within a year and wool that mats down, so treat them as a cozy slipper, not a long-term shoe.

These are the same slipper. Both carry model number AT74, the same boiled wool upper and lining, the same 10mm felt sole with latex midsole and rubber outsole, and the same 10-ounce weight. Buy whichever listing matches your size and color; there is no feature difference to weigh. Owners praise the arch support and warmth but report holes near the toes within a year and wool that mats down, so expect a comfortable slipper with a limited lifespan.

Choose the AT Hard Sole if you want the plain AT74 slipper in the color and size available on this listing.
Choose the Nordkap if you want the same AT74 slipper and this listing has your size or a color you prefer.

Prices

Haflinger AT Hard Sole Slipper: $88.49 at Amazon (checked today)
Haflinger Nordkap Wool Slippers: $120.00 at Amazon (checked today)
Difference: the Haflinger AT Hard Sole Slipper is $31.51 cheaper than the Haflinger Nordkap Wool Slippers today