Possible Clues:

• Helmet material in the tropics
• Citrus rind lining
• The white inner skin of an orange
• Spongy tissue lining rinds of oranges, or the essential part
• Spongy tissue like that lining an orange skin
• White tissue in oranges
• Soft tissue; essence
• Tropical helmet material
• Bare bones
• It is inside, soft inside