Choose between these bottoms by how you change layers. The 150 offers full-length coverage for continuous wear. The 260 zip-off is designed to come off without removing boots, with shorter legs that stop above them.
| Decision point | XKG Foundation 150 Merino Bottom | XKG Foundation 260 Zip Off Merino Bottom |
|---|---|---|
| Blend | 100% merino wool | 90% merino wool, 10% nylon |
| Leg coverage | Full length with ribbed ankle cuffs; numerical inseam not verified | Three-quarter length; numerical inseam not verified |
| Waist construction | Elastic waistband | Elastic waistband |
| Removal construction | Not verified | Full-length zipper on each leg |
| Listed garment mass | 6.2 oz | 7 oz |
| Weight basis | Size Medium | Manufacturer listed; size and measurement conditions not specified |
Do not let the lighter number settle it
Different lengths and opening hardware make this more than a fabric-weight comparison. The 150 listing and 260 listing describe different garment designs. Confirm the interface with your socks and boots before deciding whether the shorter leg is useful.
Fit concerns point in different directions
Elijah found the 150 roomy, while James found the 260 snug at the calves. Those independent accounts do not justify buying the same adjusted size in both. Use each chart and check the entire leg.
If you choose the removable version, rehearse the documented change sequence. If you do not expect to remove a base layer during the day, weigh the access feature against the simpler coverage you actually want.
