REI Lightweight Fleece Pants
Here's what other sites are saying:
The REI Lightweight Fleece pants have a simple non-bulky fit that is perfect for a boy's active pursuits. Soft, lightweight fleece construction dries quickly, packs small and offers warmth without weighing him down. Non-pilling fleece continues to look sharp, season after season. Ankle zippers allow pants to be taken off without removing footwear. Elastic waistband creates a sleek, comfortable fit that won't slow him down. Zippered front pockets are tricot-lined for comfort.