There shouldn't be any lvl restrictions. Its a worn effect. When it activates, you'll get an emote having to do with the item (ie: Your Wanderer's Sylvan Gloves shimmer with a red flame)
The posts below are wrong (mostly). This effect simply reduces mana usage by 20% when you use the lvl 64 druid spell: Summer's Flame. This one and only spell is affected by these gloves.
Edited, Mon Aug 4 14:52:12 2003