Foxwear is ideal for rucking. I should know as someone who goes on long heavy rucksack hikes. Try a Power Dry™ or Delta™ shirt along with a lightweight Neoshell™ jacket. Perfect!
Compare Foxwear Delta shirts at $45 with https://www.haglofs.com/en/activities/mountaineering/mountaineering-baselayers/lim-zt-ii-air-base-men-6077292AT