I mainly design garments for the outdoor life meant to be used on adventures high up in the snowy mountains, along the stormy coasts, inside the wild forests. Therefore I only use pure wool and my favorites are untreated icelandic, norwegian and north american wool.
Did you know wool is very robust and durable and has many amazing properties such as being self-cleaning?

Lettlopi is a pure Icelandic wool Aran weight yarn with a gauge
of 18 sts on 10 cm I love to use it in many of my Patterns. I have listed a few alternatives you can use instead!

You can be very creative and even play around with yarn weights as long as you stay mindful to archive the right gauge!

-Platulopi (100% Icelandic wool): Size up 1 needles size! Perfect for outdoor use!
-Tones, Loft and Shelter by Brooklyn Tweed (100% american wool): Perfect for outdoor use!
-Biches & Buches- Le Lambswool (100% wool) : Perfect for outdoor use!
-Stonehedge Shepherd's Wool (100% wool): Perfect for outdoor use!
-Blue Sky Fibers Woolstok Worsted ( 100% Fine Highland Wool) : Perfect for outdoor use!
-Quince & Co. Lark, Owl and Tweed (100% American wool) :Suitable for everyday garments.
-Brown Sheep Nature Spun (100% American wool): Perfect for outdoor use!
-Harrisville Designs FlyWHEEL (100% Pure Virgin Wool) : Suitable for everyday garments.
-Jill Draper Makes Stuff Windham (100% American wool): Suitable for everyday garments.
- Knit Picks Swish (100% wool) : Suitable for everyday garments
-Knit Picks Wool of the Andes Worsted (100% Peruvian highland wool): Perfect for outdoor use!
-Lion Brand LB Collection Superwash Merino (100% merino wool)
-Drops Air (65% Alpaca, 28% Polyamide, 7% Wool): Suitable for everyday garments.
-Drops Alaska (100% wool): Suitable for everyday garments.
-Pure merino from Mimilano (100% merino wool) Extra warm and perfect for outdoor use!
-Drops Nepal (65% wool 35% alpaca) : Suitable for everyday garments.
-Malabrigo Yarn Rios (100% Superwash Merino Wool) : Suitable for everyday garments.
-Cascade Yarns Tweed Valley Yarns (100% Superwash Wool): Suitable for everyday garments.
-Julie Asselin - Nurtured (100% Fine Wool (Rambouillet + Targhee + Merino): Perfect for outdoor use!

Do you have more yarn alternative you like to use? Let me know!
loparefur@gmail.com or comment below :-)