Per all the cool kids; they say, "Get this one". ...so that's apparently the best description we could give you.

• 100% organic cotton exterior
• Charcoal Melange’s exterior is 60% organic cotton, 40% recycled polyester
• 80% organic cotton, 20% recycled polyester interior
• 97% organic cotton, 3% elastane ribs
• Fabric weight: 8.3 oz/yd² (280 g/m²)
• Fabric weight for Charcoal Melange: 10.3 oz/yd² (348 g/m²)
• Side-seamed
• Raglan sleeves
• Neck tape
• Brushed fleece lining
• 2 × 2 ribbed cuffs, collar, and hem

Disclaimer: US customers should order a size up  But you were probably gonna anyway.