Footwear giants Nike, Crocs, Deckers, and ON Holdings face tariff headwinds as US duties on Vietnam and Indonesia exports rise to 20% and 19%. China may see a 30% rate from August 12. Shares fell last week, with Deckers down 11.6%. Nike warns of $1B in costs. Stocktwits sentiment is bearish for Nike and Deckers, but bullish for Crocs and ON.