From Hey Dude, the Men's Wally Linen Washable Chukkas feature:

• Linen canvas upper
• 2 lacing options
• Flex & Fold Technology
• Slip-on design with laces
• Soft oxford cloth lining
• Memory foam insole
• Ultra-Light outsole
• Machine washable (cold)
• Sizing Tip: If you usually wear half sizes, they suggest choosing the next size up for the best fit